ISO 7010 Warning Symbols: Meanings and Uses

This symbol can be used in workplaces, factories, warehouses, construction sites, laboratories, public buildings and other environments where people need to be alerted to a potential danger. It should normally be positioned close to the hazard or at the point where people need to become aware of the risk before proceeding.

The W001 symbol is particularly useful when combined with supplementary text or additional safety information explaining the nature of the hazard. This allows the general warning triangle to attract attention while the accompanying message tells the user exactly what danger is present or what precautions may be necessary.

Using the W001 General Warning symbol provides a clear and internationally recognised way of drawing attention to safety information. It can help reduce the risk of people overlooking a hazard and supports consistent warning signage where a dedicated hazard-specific ISO 7010 symbol is not available.

This symbol should be displayed in locations where explosives or materials capable of exploding are stored, handled or used. Typical applications may include explosives storage areas, specialist manufacturing facilities, laboratories, demolition operations, mining environments and other controlled locations where an explosion hazard has been identified.

The W002 symbol is particularly important because an explosion can produce blast pressure, flying debris, fire and serious injury within a very short period of time. Clearly warning people before they enter the hazardous area helps ensure that appropriate precautions and site-specific safety procedures can be followed.

Using the W002 Explosive Material symbol provides a clear and internationally standardised warning that can be recognised quickly. It helps draw attention to potentially severe hazards, supports safe handling and access controls, and reinforces the need to avoid actions or ignition sources that could increase the risk of an explosion.

This symbol should be displayed in locations where radioactive substances, radiation-producing equipment or controlled radiation sources are stored, handled or used. Typical applications include hospitals, laboratories, research facilities, industrial testing areas, nuclear facilities and other environments where ionizing radiation may be present.

The W003 symbol is particularly important because ionizing radiation cannot normally be detected by human senses. Clear warning signage helps prevent people from unknowingly entering controlled areas or approaching radiation sources without the necessary training, protective measures or monitoring equipment.

Using the W003 Radioactive Material or Ionizing Radiation symbol provides a clear and internationally recognised warning of a potentially serious hazard. It supports access control, radiation safety procedures and risk awareness while helping employees, contractors and visitors recognise areas where additional precautions are required.

This symbol should be displayed wherever laser equipment is used and where hazardous laser radiation may be accessible. Typical locations include laboratories, research facilities, medical environments, manufacturing areas, engineering workshops and other workplaces containing laser systems or laser-processing equipment.

The W004 symbol is especially important because a laser beam may be difficult or impossible to see, depending on its wavelength, while still being capable of causing injury. Clear warning signage helps prevent accidental exposure and reminds employees, contractors and visitors not to look directly into the beam or enter controlled laser areas without appropriate precautions.

Using the W004 Laser Beam symbol provides a standardised and internationally recognised warning for laser hazards. It supports access control, safe operating procedures and awareness around laser equipment while helping people quickly recognise that potentially hazardous optical radiation may be present.

This symbol should be displayed near equipment, systems or controlled areas that generate elevated levels of non-ionizing radiation. Typical applications include telecommunications equipment, RF transmitters, medical electrical systems, research facilities and certain industrial installations.

The W005 symbol is particularly useful because non-ionizing radiation may not be visible or otherwise obvious to people approaching the area. Clear warning signage helps employees, contractors and visitors recognise that specialist equipment is operating and that access restrictions or exposure controls may apply.

Using the W005 Non-Ionizing Radiation symbol provides a standardised and internationally recognised warning for electromagnetic radiation hazards. It supports controlled access, safer working procedures and greater awareness around equipment that may produce potentially hazardous levels of non-ionizing radiation.

This symbol should be displayed around equipment and installations that generate significant magnetic fields, such as MRI scanners, research magnets, industrial magnetic systems and specialist laboratory equipment. It is usually positioned at entrances, access points or close to the source of the magnetic field so the hazard is recognised before people move into the affected area.

The W006 symbol is especially important because a strong magnetic field may not be visible or obvious. It can attract ferromagnetic objects with considerable force and may interfere with certain implanted medical devices or sensitive equipment, making clear warning signage essential for controlling access and preventing unsafe items from entering the area.

Using the W006 Magnetic Field symbol provides a clear and standardised warning that helps employees, contractors, patients and visitors recognise where magnetic-field precautions apply. It supports safer access control, reinforces local safety procedures and helps reduce the risk of injury, equipment damage or interference with medical devices.

This symbol is suitable for factories, warehouses, workshops, plant rooms, construction sites and public buildings where low-level obstacles may be difficult to notice. It should be positioned before the hazard so pedestrians have enough time to adjust their route or step safely around it.

The W007 symbol is particularly useful where objects such as pipes, thresholds, supports, equipment bases or other fixed obstructions project into a walking route. Clear warning signage helps draw attention to hazards that might otherwise blend into the surrounding floor or be overlooked in busy environments.

Using the W007 Floor-Level Obstacle symbol provides a standardised way of warning people about trip hazards at ground level. It can help reduce slips, trips and falls, improve pedestrian awareness and support safer movement through areas where permanent or unavoidable floor-level obstructions are present.

This symbol should be displayed near unprotected edges, platforms, loading areas, stair openings, pits, elevated walkways and other places where a significant drop may not be immediately obvious. It is commonly used in factories, warehouses, construction sites, industrial premises and maintenance areas.

The W008 symbol is especially useful where poor lighting, busy surroundings or an unfamiliar layout could make the change in level difficult to notice. Clear warning signage helps draw attention to the hazard before someone reaches the edge and encourages greater care when moving through the area.

Using the W008 Drop (Fall) symbol provides a clear and standardised warning of a potentially serious fall hazard. It can help improve awareness, support safer pedestrian movement and reduce the likelihood of accidents in areas where there is a risk of falling to a lower level.

This symbol is particularly suitable for laboratories, hospitals, healthcare facilities, research centres, waste-handling areas and other locations where biological contamination may occur. It should be displayed at entrances, storage areas, containers or equipment where exposure to biological hazards is possible.

Biological hazards may include bacteria, viruses, contaminated body fluids, biological waste and other materials capable of causing infection or illness. The W009 symbol provides an immediate visual warning that additional precautions, hygiene controls or suitable personal protective equipment may be required.

Using the W009 Biological Hazard symbol provides a standardised and widely recognised method of identifying areas where biological risks are present. It can support infection-control procedures, safer handling practices and restricted access while helping workers and visitors recognise the need for additional care before entering or handling affected materials.

This symbol is particularly suitable for cold stores, freezers, refrigerated rooms, cryogenic areas and other workplaces where unusually low temperatures are encountered. It should be positioned at entrances or before the affected area so people are aware of the cold conditions before entering.

Low-temperature environments can create risks such as cold burns, frostbite and reduced dexterity, particularly where people remain exposed for extended periods or come into contact with very cold surfaces. The W010 symbol helps draw attention to these conditions and encourages appropriate precautions before work begins.

Using the W010 Low Temperature symbol provides a standardised visual warning for areas where cold or freezing conditions present a hazard. It can support safer working procedures, suitable protective clothing requirements and better awareness of temperature-related risks in refrigerated or specialist environments.

This symbol is particularly suitable for entrances, corridors, production areas, kitchens, washrooms, swimming facilities and outdoor routes where water, oil, ice, snow or other substances may create a slipping hazard. It should be positioned before or close to the affected surface so people can recognise the risk before stepping onto it.

Slippery surfaces can develop temporarily following cleaning, spills, rainfall or freezing conditions, or may be an ongoing feature of particular working environments. The W011 symbol provides an immediate visual warning where the danger may not otherwise be obvious, helping people adjust their movement and avoid sudden slips or falls.

Using the W011 Slippery Surface symbol provides a standardised way of identifying areas with an increased risk of slipping. It can support housekeeping procedures, temporary hazard controls and safer pedestrian movement while helping reduce injuries caused by slips and falls.

This symbol is commonly used on electrical panels, switchgear, substations, machinery, control cabinets and other equipment where access to live electrical components is possible. It should be positioned where the warning can be seen before a person approaches, opens or works on the electrical installation.

Electrical hazards are often hidden behind covers, doors or enclosures, meaning the danger may not be immediately visible. The W012 symbol provides a clear visual indication that additional care is required and that appropriate isolation procedures, authorised access or electrical safety precautions may be necessary.

Using the W012 Electricity symbol provides a standardised way of identifying areas where electrical energy presents a hazard. It can support safer maintenance practices, reinforce restricted access and help reduce the risk of accidental contact with dangerous electrical equipment.

This symbol is particularly suitable for gated premises, warehouses, compounds, construction sites, industrial facilities, farms and other locations where dogs are used for security. It should be positioned at entrances, gates, fences or other access points where it can be seen before someone enters the guarded area.

Because a guard dog may not be immediately visible, people approaching the site may be unaware of the risk until they have already entered its patrol area. The W013 symbol provides an advance warning and encourages people to wait until the dog has been secured or placed under appropriate control.

Using the W013 Guard Dog symbol provides a standardised way of identifying areas protected by security dogs. It can support access-control procedures, improve visitor awareness and help reduce the risk of accidental encounters with a guard dog.

This symbol is commonly displayed in warehouses, factories, loading bays, distribution centres, storage facilities and other workplaces where forklifts regularly travel. It is particularly useful at entrances, junctions, blind corners and points where pedestrian routes cross vehicle operating areas.

Forklift movements can present a significant hazard because drivers may have restricted visibility, vehicles may reverse unexpectedly and loads can obstruct the operator’s view. The W014 symbol provides an immediate visual warning that people should remain alert and check for approaching vehicles before entering or crossing the area.

Using the W014 Forklift Trucks symbol can support pedestrian and vehicle segregation measures and reinforce safer movement around busy workplaces. Clearly identifying forklift operating areas helps workers and visitors recognise the traffic hazard and take greater care when moving through locations shared with industrial vehicles.

This symbol is particularly suitable for construction sites, warehouses, factories, loading areas, docks and other workplaces where cranes, hoists or lifting equipment are regularly used. It should be displayed at entrances, lifting zones or other locations where people could pass beneath suspended materials or equipment.

Overhead loads can be especially dangerous because a failure of lifting equipment, rigging or load security may occur with little warning. The W015 symbol provides a clear visual reminder to remain alert, avoid standing beneath suspended loads and follow any designated exclusion zones or lifting procedures.

Using the W015 Overhead Load symbol provides a standardised way of identifying areas where lifting operations present a risk from above. It can support safer lifting practices, reinforce restricted-access areas and help reduce the risk of injuries caused by falling or swinging loads.

This symbol is commonly used in laboratories, chemical storage areas, industrial facilities, manufacturing sites and other workplaces where toxic substances are handled, stored or processed. It may also be displayed on containers, equipment or controlled areas where exposure to hazardous materials is possible.

Toxic substances can present a danger even when relatively small quantities are involved, depending on the material and the route of exposure. The W016 symbol provides a clear visual warning that direct contact should be avoided and that suitable handling procedures, protective equipment or access restrictions may be required.

Using the W016 Toxic Material symbol provides a standardised way of identifying locations and materials where poisoning is a potential hazard. It can support safer chemical handling, improve awareness of hazardous substances and help reduce the risk of accidental exposure.

This symbol is commonly used on machinery, boilers, ovens, heating equipment, pipework, industrial process equipment and other surfaces that can reach hazardous temperatures. It should be positioned where it can be clearly seen before someone touches or works close to the hot surface.

Hot surfaces can present a particular risk because equipment may appear safe while still retaining considerable heat after operation or shutdown. The W017 symbol provides an immediate visual warning to avoid direct contact and to allow equipment to cool or use suitable protective measures where necessary.

Using the W017 Hot Surface symbol provides a standardised way of identifying surfaces where contact could result in thermal burns. It can support safer maintenance and operating procedures, improve awareness around heated equipment and help reduce accidental contact with dangerously hot surfaces.

This symbol is particularly suitable for automated production machinery, conveyor systems, pumps, fans, processing equipment and other installations that can start in response to timers, sensors, control systems or remote commands. It should be displayed where people may approach, inspect or work close to equipment capable of automatic activation.

Automatic start-up presents a particular hazard because machinery may appear stationary or inactive immediately before movement begins. The W018 symbol provides an advance warning that equipment should not be assumed to be safe simply because it is not currently moving, especially during inspection, cleaning or maintenance work.

Using the W018 Automatic Start-Up symbol provides a standardised way of identifying machinery that may activate unexpectedly. It can support isolation and lockout procedures, improve awareness around automated equipment and help reduce the risk of injury caused by sudden movement of mechanical parts.

This symbol is particularly suitable for machinery, industrial equipment, loading systems, automated installations and other locations where crushing points are present. It should be displayed close to the hazardous area or before access so people are made aware of the danger before approaching moving components.

Crushing hazards can occur where equipment closes, shifts, travels or moves against a fixed structure, sometimes with very little warning. The W019 symbol helps draw attention to these danger zones and encourages people to keep clear while machinery is operating or before suitable isolation measures have been applied.

Using the W019 Crushing symbol provides a standardised way of identifying locations where mechanical movement could trap or compress part or all of the body. It can support machinery safety procedures, restricted access and safer maintenance practices while helping reduce the risk of serious crushing injuries.

This symbol is particularly suitable for warehouses, factories, construction sites, plant rooms, loading areas and other locations where beams, pipes, machinery or structural features extend into a pedestrian route. It should be displayed before the obstruction so people have sufficient warning to adjust their movement or choose an alternative route.

Overhead obstacles can be easy to miss when attention is focused on the floor, surrounding machinery or other workplace activity. The W020 symbol provides a clear visual reminder to look ahead and above, helping people avoid accidental impact with fixed structures or equipment.

Using the W020 Overhead Obstacle symbol provides a standardised way of identifying areas with restricted headroom or projecting objects. It can support safer pedestrian movement, improve awareness of structural hazards and help reduce injuries caused by striking overhead obstructions.

This symbol is commonly used in chemical stores, laboratories, workshops, fuel storage areas, industrial facilities and other locations where flammable liquids, gases or materials are handled or stored. It should be positioned where people can see the warning before approaching the hazardous area or equipment.

Flammable materials may release vapours or ignite under conditions that are not immediately obvious, making clear identification particularly important. The W021 symbol helps reinforce the need to keep ignition sources away and follow appropriate storage, handling and fire-prevention procedures.

Using the W021 Flammable Material symbol provides a standardised way of identifying areas where combustible substances present a fire hazard. It can support safer handling practices, improve awareness of ignition risks and help reduce the likelihood of accidental fires in workplaces and storage environments.

This symbol is particularly suitable for machinery, cutting equipment, laboratory devices, medical equipment and other locations where blades, needles, sharp edges or pointed components may be encountered. It should be displayed close to the hazard or before access to the affected area so people are warned before making contact.

Sharp elements may form part of equipment that otherwise appears safe, especially where the hazardous component is small or partially concealed. The W022 symbol provides a clear visual reminder to keep hands and other body parts away from the danger and to follow appropriate handling or operating procedures.

Using the W022 Sharp Element symbol provides a standardised way of identifying equipment and areas where sharp components could cause injury. It can support safer working practices, improve awareness around cutting and piercing hazards and help reduce accidental contact with blades, needles and other sharp objects.

This symbol is particularly suitable for laboratories, chemical stores, industrial facilities, cleaning areas and other workplaces where corrosive acids, alkalis or similar substances are used or stored. It may also be displayed on containers, equipment or controlled areas where accidental exposure could occur.

Corrosive substances can damage skin and tissue rapidly and may also attack certain materials or surfaces. The W023 symbol provides a clear visual warning that direct contact should be avoided and that suitable handling procedures, protective equipment or other precautions may be necessary.

Using the W023 Corrosive Substance symbol provides a standardised way of identifying areas and materials where corrosive chemicals present a hazard. It can support safer chemical handling, improve awareness of exposure risks and help reduce the likelihood of burns or other injuries caused by accidental contact.

This symbol is particularly suitable for presses, powered doors, guards, clamps, lifting equipment, machinery and other installations where components move together or close against a fixed surface. It should be positioned close to the danger point so the warning is visible before someone reaches into the affected area.

Hand-crushing hazards can develop very quickly and may not leave enough time for a person to withdraw once movement begins. The W024 symbol helps draw attention to these specific danger zones and reinforces the need to keep hands clear while equipment is operating or capable of movement.

Using the W024 Crushing of Hands symbol provides a standardised warning for machinery and equipment where hand injuries could occur. It can support safer operating and maintenance procedures, improve awareness of pinch points and help reduce the risk of serious crushing injuries to fingers and hands.

This symbol is particularly suitable for printing presses, conveyors, laminating machines, textile machinery, processing equipment and other installations containing rollers that rotate towards one another. It should be positioned close to the hazardous point or before access to the machinery so the danger is clearly visible.

Counterrotating rollers can pull objects into the gap between them very quickly, leaving little time to react once contact has been made. The W025 symbol helps draw attention to these nip points and reinforces the need to keep hands, loose clothing and other items away while the equipment is operating.

Using the W025 Counterrotating Rollers symbol provides a standardised warning for machinery where drawing-in movement presents a risk of entanglement or crushing. It can support machine-guarding measures, safer operating procedures and maintenance controls while helping reduce the likelihood of serious injury.

This symbol is particularly suitable for forklift charging stations, workshops, warehouses, garages, industrial facilities and other locations where rechargeable batteries are regularly connected to charging equipment. It should be displayed at entrances or close to designated charging areas so the warning is visible before people approach the batteries.

Battery charging can produce hydrogen, which may accumulate and create an explosive atmosphere if ventilation is inadequate. Batteries can also contain corrosive acid capable of causing serious injury if it leaks, spills or comes into contact with the skin or eyes. The W026 symbol helps draw attention to both of these potential hazards.

Using the W026 Battery Charging symbol provides a standardised way of identifying areas where battery charging activities present additional safety risks. It can support ventilation requirements, safer battery handling procedures and appropriate protective measures while helping reduce the risk of fire, explosion or chemical exposure.

This symbol is particularly suitable for laboratories, manufacturing equipment, specialist lighting systems, industrial processes and other locations where powerful optical radiation sources are used. It should be positioned near the equipment or before entry into an affected area so people are aware of the exposure risk in advance.

Optical radiation can damage the eyes or skin even when the source does not appear immediately dangerous. The W027 symbol helps draw attention to this less obvious hazard and reinforces the need to avoid direct exposure, follow operating instructions and use appropriate protective measures where required.

Using the W027 Optical Radiation symbol provides a standardised way of identifying areas and equipment where hazardous optical radiation may occur. It can support safer operating procedures, improve awareness of radiation exposure risks and help reduce the likelihood of eye or skin injuries.

This symbol is particularly suitable for laboratories, chemical stores, industrial facilities, manufacturing areas and other workplaces where oxidising chemicals are used or kept. It may be displayed near storage locations, containers, processing equipment or controlled areas where exposure to oxidising substances is possible.

Oxidising substances may not necessarily burn themselves, but they can supply oxygen or otherwise promote combustion, causing other materials to ignite more easily or burn more fiercely. The W028 symbol therefore helps highlight the need to keep incompatible and combustible materials away from the hazard.

Using the W028 Oxidising Substance symbol provides a standardised way of identifying locations where oxidising chemicals present an increased fire or reaction risk. It can support safer chemical storage, improve awareness of incompatible materials and help reduce the likelihood of fires or dangerous reactions.

This symbol is particularly suitable for gas cylinder stores, workshops, laboratories, industrial facilities, warehouses and other locations where pressurised cylinders are stored, used or handled. It should be displayed at access points, storage areas or close to the cylinders so the hazard is clearly identified before people approach.

Pressurised cylinders can release a large amount of stored energy if they rupture or if a valve is damaged, potentially causing the cylinder or its components to move violently. Exposure to excessive heat can also increase internal pressure and raise the risk of failure.

Using the W029 Pressurised Cylinder symbol provides a standardised way of identifying areas where cylinders under pressure present a hazard. It can support safer storage and handling practices, reinforce the need to protect cylinders from heat and physical damage, and help reduce the risk of serious accidents.

This symbol is specifically associated with press brake machinery used for bending and forming sheet metal. It should be positioned close to the hazardous tool area or at suitable access points where it can be clearly seen before an operator reaches into or works near the closing mechanism.

The crushing action of a press brake can occur quickly and with considerable force, leaving little opportunity to withdraw a hand once the tool begins to close. The W030 symbol therefore provides an important visual reminder to maintain safe hand positioning and follow the machine’s guarding, operating and isolation procedures.

Using the W030 Hand Crushing Between Press Brake Tool symbol provides a standardised warning for this specific machinery hazard. It can support safer press brake operation, improve awareness of dangerous closing points and help reduce the risk of severe hand and finger injuries.

This symbol is specifically suitable for press brake machinery used in metalworking and fabrication. It should be displayed close to the working area where the material and moving parts of the press brake can create a trapping or crushing point during operation.

As the press brake forms the workpiece, the material can move or change position rapidly and may trap a hand against part of the machine. The W031 symbol provides a clear visual reminder to maintain safe hand positioning and avoid placing fingers between the workpiece and moving components.

Using the W031 Hand Crushing Between Press Brake and Material symbol provides a standardised warning for this specific press brake hazard. It can support safer operating procedures, improve awareness of trapping points and help reduce the risk of severe hand and finger injuries during bending operations.

This symbol is specifically suited to press brake machinery used for bending and forming sheet metal. It should be displayed close to the operating area where long, heavy or projecting workpieces may move through a significant arc as the machine completes a bend.

During press brake operation, the workpiece can rise, swing or change position rapidly as pressure is applied. This movement can create an impact or trapping hazard for anyone standing too close, particularly when processing large sheets or components that extend beyond the machine.

Using the W032 Rapid Movement of Workpiece in Press Brake symbol provides a standardised warning for this specific metalworking hazard. It can support safer operator positioning, reinforce exclusion zones around moving material and help reduce the risk of injury caused by unexpected workpiece movement.

This symbol is particularly suitable for security fencing, construction sites, industrial compounds, agricultural land, restricted areas and other locations where barbed wire is used as a physical barrier. It should be displayed at access points or along the perimeter where people may come close to the hazard.

Barbed wire can be difficult to see clearly in poor lighting or from a distance, particularly where it is positioned above fences or among vegetation. The W033 symbol provides an immediate visual warning that sharp wire is present and encourages people to avoid direct contact.

Using the W033 Barbed Wire symbol provides a standardised way of identifying fencing and barriers that could cause injury. It can support perimeter safety, improve awareness around restricted areas and help reduce the risk of accidental cuts or puncture wounds from contact with barbed wire.

This symbol is particularly suitable for farms, fields, agricultural land, livestock enclosures and other rural areas where bulls may be present. It should be positioned at gates, entrances, footpaths or other access points so people are made aware of the animal hazard before entering the area.

Bulls can be unpredictable and may react aggressively if they feel threatened, disturbed or approached too closely. The W034 symbol provides a clear visual warning that extra caution is required and encourages people to maintain a safe distance and avoid unnecessary interaction with the animals.

Using the W034 Bull symbol provides a standardised way of identifying areas where bulls present a potential danger. It can improve awareness around livestock, support safer access to agricultural land and help reduce the risk of accidental encounters or injuries caused by bull attacks.

This symbol is particularly suitable for construction sites, scaffolding areas, warehouses, loading zones, industrial facilities and other locations where work or storage takes place above pedestrian level. It should be positioned before the hazardous area so people can recognise the risk before moving underneath.

Falling objects may result from unsecured materials, maintenance work, lifting operations or items being displaced from elevated platforms or storage systems. The W035 symbol provides a clear visual warning that additional care is required and that access beneath overhead work may need to be controlled.

Using the W035 Falling Objects symbol provides a standardised way of identifying areas where objects could fall from height. It can support exclusion zones, safer pedestrian routes and site safety procedures while helping reduce the risk of injuries caused by falling materials or equipment.

This symbol is particularly suitable for industrial buildings, warehouses, agricultural premises, older structures and other locations with fragile roofing materials, rooflights or weakened roof sections. It should be displayed at access points, ladders, roof entrances or other positions where people may approach the hazardous area.

Fragile roofs can appear solid even when they are incapable of supporting body weight, making the danger difficult to judge visually. The W036 symbol provides an important advance warning that suitable access equipment, fall protection or alternative working methods may be required before anyone goes onto the roof.

Using the W036 Fragile Roof symbol provides a standardised way of identifying roof areas where there is a risk of falling through the surface. It can support safer roof-access procedures, reinforce restricted access and help reduce the likelihood of serious falls from height.

This symbol is particularly suitable for warehouses, factories, industrial plants, logistics facilities and other workplaces where remotely controlled or automated mobile machinery operates. It should be displayed at entrances, crossing points or other locations where pedestrians may come into contact with moving equipment.

Because a remote operator may control the machine from another position, its movement can be less predictable to nearby pedestrians than conventional manually operated equipment. The W037 symbol helps draw attention to this risk and encourages people to remain alert when entering or passing through the operating area.

Using the W037 Run Over by Remote Operator-Controlled Machine symbol provides a standardised warning for areas where remotely operated moving equipment presents a collision or crushing hazard. It can support pedestrian segregation, restricted-access procedures and safer interaction between personnel and mobile machinery.

This symbol is particularly suitable for factories, workshops, industrial plants, testing facilities and other environments where machinery, processes or equipment can generate abrupt loud noises. It should be positioned before entry into the affected area so people are made aware of the noise hazard in advance.

Sudden noise can present a different risk from continuously high sound levels because people may have little or no warning before it occurs. The W038 symbol helps draw attention to locations where unexpected noise events are possible and where additional precautions, such as hearing protection, may be required.

Using the W038 Sudden Loud Noise symbol provides a standardised way of identifying areas where abrupt high noise levels may occur. It can support hearing-conservation measures, improve awareness of workplace noise hazards and help people take appropriate precautions before entering the area.

This symbol is particularly suitable around buildings, roofs, bridges, canopies, industrial structures and other elevated surfaces where ice can form during freezing conditions. It should be positioned before people enter the potential fall zone so they have an opportunity to avoid the hazardous area.

Falling ice can be especially dangerous because it may detach suddenly as temperatures change or accumulated ice begins to thaw. Even relatively small pieces falling from height can cause significant injury, making clear warning signage important where overhead ice formation is known to occur.

Using the W039 Falling Ice symbol provides a standardised visual warning of this seasonal or environmental hazard. It can support temporary access restrictions, safer pedestrian routes and other precautions designed to keep people away from areas where ice may fall from overhead.

This symbol is particularly suitable around buildings in areas that experience heavy snowfall, especially beside entrances, walkways, car parks and other places where people may pass beneath snow-covered roofs. It should be positioned where the warning can be seen before someone enters the potential fall zone.

The W040 symbol is useful because large amounts of snow can remain on a roof for some time before moving without warning. Rising temperatures, melting, refreezing or additional snowfall can alter the stability of accumulated snow and cause it to slide from pitched or elevated roof surfaces.

Using the W040 Roof Avalanche symbol provides a standardised way of warning people to take additional care near snow-covered buildings. It can support temporary access restrictions, safer pedestrian routes and other precautions designed to reduce exposure to falling snow and ice.

This symbol is particularly appropriate for confined spaces, tanks, chambers, enclosed plant areas and locations where gases may displace oxygen or create an unsafe atmosphere. It should be displayed before entry into the hazardous area so workers and authorised personnel are made aware of the breathing risk in advance.

An asphyxiating atmosphere may not have an obvious smell, colour or other visible warning, making it especially dangerous. The W041 symbol helps communicate that normal breathing conditions cannot be assumed and that atmospheric testing, ventilation or suitable respiratory precautions may be necessary before entry.

Using the W041 Asphyxiating Atmosphere symbol provides a standardised warning for areas where the atmosphere itself presents a serious hazard. It can support confined-space procedures, restricted access and safer working practices by reminding personnel to avoid exposure unless appropriate controls are in place.

This symbol is particularly suitable for electrical switchgear, distribution boards, control panels, substations and other electrical installations where an arc flash hazard has been identified. It should be displayed where workers or contractors may approach, open or carry out work on energised electrical equipment.

The W042 symbol helps draw attention to hazards that may not be apparent from the outside of an electrical enclosure. Where an arc flash risk exists, equipment may need to be de-energised before access or appropriate specialist protective equipment may be required. ISO also specifies that supplementary text should normally be used with W042 unless its meaning is already communicated through manuals, instructions or training.

Using the W042 Arc Flash symbol provides a standardised visual warning around electrical equipment where a severe energy release could occur. It can support electrical safety procedures, reinforce restricted-access controls and help workers recognise when additional precautions are necessary before approaching or working on the equipment.

This symbol is particularly suitable for frozen lakes, ponds, reservoirs, canals and other areas where people may be tempted to walk, skate or travel across ice. It should be positioned at access points or around known hazardous areas so the danger is clear before someone steps onto the frozen surface.

Ice thickness and strength can vary considerably across the same body of water and may change quickly because of temperature, currents, weather conditions or moving water beneath the surface. The W043 symbol therefore provides an important warning where ice may appear solid but cannot be assumed to be safe.

Using the W043 Thin Ice symbol gives visitors and members of the public a clear, internationally standardised warning of the hazard. It can support access restrictions, discourage unsafe entry onto frozen water and help reduce the risk of immersion, hypothermia or drowning caused by ice failure.

This symbol is particularly suitable for marinas, harbours, lakes, rivers, reservoirs and coastal launching areas where boats are regularly moved between land and water. It should be positioned at access points, approach roads or before the ramp so users can recognise the hazard before entering the slipway area.

The W044 symbol is useful because slipways can combine several risks, including steep gradients, wet surfaces, reversing vehicles and changing water levels. Clear warning signage helps visitors remain alert and encourages safer movement around areas where boat launching or recovery is taking place.

Using the W044 Slipway symbol provides a standardised way of warning people about the presence of a boat-launching ramp. It can improve awareness, support safer traffic and pedestrian movement, and help reduce the risk of slips, collisions or accidental entry into the water.

This symbol is particularly suitable for lakes, reservoirs, coastal recreation areas, marinas and designated watersports zones where activities such as water skiing, wakeboarding or other towed water sports are carried out. It should be positioned at access points or shoreline areas where users can see the warning before entering the activity zone.

The W045 symbol is especially useful because tow ropes and fast-moving participants may not always be obvious to people approaching the area. Clear warning signage helps other water users keep a safe distance and reduces the chance of interference with towing operations or accidental contact with a vessel or tow line.

Using the W045 Towed Water Activity Area symbol provides a standardised way of warning people about active towing zones. It can support safer separation between different recreational activities, improve awareness around busy waterways and help reduce the risk of collisions or entanglement.

This symbol is particularly suitable for beaches, surf zones and designated coastal recreation areas where surf craft are regularly used. It should be positioned at access points, beach entrances or close to the affected water area so visitors can recognise the activity before entering.

The W046 symbol is useful because surf craft can approach quickly and may be difficult to avoid once a rider is travelling on a wave. Clear warning signage helps swimmers and other users remain alert, keep suitable separation and avoid entering areas primarily used for surf activity.

Using the W046 Surf Craft Area symbol provides a standardised way of warning people about active surf zones. It can support safer sharing of beaches, improve awareness among visitors and help reduce the risk of collisions between surf craft and other people in the water.

Deep Water signs are particularly appropriate around swimming pools, reservoirs, lakes, harbours, docks and other aquatic environments where significant depth is present close to an access point or shoreline. The symbol should be placed where it can be seen before someone enters the water or approaches the hazardous area.

One of the main benefits of the W047 symbol is that water depth is often difficult to estimate by sight alone. A location may appear harmless from the surface while being far deeper than expected, so a clear warning can help swimmers, visitors and children recognise the potential danger before entering.

Displaying the W047 Deep Water symbol supports safer use of aquatic environments by providing an internationally standardised warning of increased water depth. It can help discourage unsuitable entry, improve awareness among less confident swimmers and reduce the risk of drowning or distress in areas where standing is not possible.

This symbol is particularly suitable for swimming pools, leisure pools, lakes, beaches and other aquatic areas where diving could be attempted despite insufficient water depth. It should be positioned at pool edges, access points or other visible locations before people enter the water.

The W048 symbol is especially important because water depth can be difficult to judge accurately from the surface. Clear warning signage helps discourage diving into shallow areas and reduces the risk of head, neck or spinal injuries caused by striking the bottom or another underwater surface.

Using the W048 Shallow Water (Diving) symbol provides a standardised way of warning people that diving is hazardous in the marked area. It can improve awareness, support safer swimming behaviour and help reinforce local pool or water-safety rules where shallow conditions are present.

This symbol is particularly suitable for swimming areas, lakes, rivers, harbours, beaches, reservoirs and other aquatic locations where rocks, structures, debris or other objects may lie below the surface. It should be positioned at access points or close to the affected area so users are warned before entering the water.

The W049 symbol is especially useful because submerged hazards can be difficult or impossible to identify visually, particularly in deep, murky or moving water. Clear warning signage helps people avoid diving, jumping or swimming into areas where hidden objects could cause serious injury.

Using the W049 Submerged Objects symbol provides a standardised way of warning people about underwater hazards. It can improve awareness, support safer swimming and water-sports activities, and help reduce the risk of impact injuries caused by objects concealed beneath the surface.

This symbol is particularly suitable for swimming pools, leisure pools, wave pools and other aquatic facilities where the pool floor slopes or drops sharply. It should be positioned at the poolside or before the affected section so swimmers can recognise the depth change before entering or moving through the water.

The W050 symbol is especially useful where the change in depth is difficult to judge from the surface. Clear warning signage helps weaker swimmers, children and unfamiliar users understand that the water may become significantly deeper within a short distance.

Using the W050 Sudden Drop in Swimming Pool or Leisure Pool symbol provides a standardised way of warning about abrupt depth changes. It can improve awareness around pool hazards, support safer swimming behaviour and help reduce the risk of panic, loss of footing or drowning in areas where the pool becomes deep suddenly.

This symbol is particularly suitable for roofs, platforms, elevated walkways, loading areas, construction sites and other locations where people may approach an exposed edge. It should be positioned before the hazardous area so the warning can be seen before someone comes close to the drop.

The W051 symbol is especially useful where an unprotected edge may not be immediately obvious because of poor lighting, unfamiliar surroundings or distracting work activity. Clear warning signage helps workers, contractors and visitors recognise the fall hazard and maintain a safer distance from the edge.

Using the W051 Unprotected Edges symbol provides a standardised warning for locations where fall protection is incomplete or absent. It can improve awareness, support access-control measures and help reduce the risk of serious injuries caused by falls from height.

This symbol is particularly suitable for coastal cliffs, quarries, steep embankments, viewpoints, walking routes and other locations where erosion or ground movement may have weakened the edge. It should be positioned before people reach the hazardous area so they are warned to keep back from the drop.

The W052 symbol is especially useful because an unstable edge may look solid even when the ground beneath it has been undermined or weakened. Weathering, erosion, heavy rainfall and previous ground movement can all reduce stability and increase the risk of sudden collapse.

Using the W052 Unstable Cliff Edge symbol provides a clear and standardised warning to stay away from potentially unsafe edges. It can support access restrictions, improve public awareness and help reduce the risk of serious falls in areas where the ground near a cliff edge cannot be considered secure.

This symbol is particularly suitable for coastal cliffs, quarries, cuttings, mountain paths, construction sites and other locations where rock or soil instability has been identified. It should be positioned before people enter the affected area so they can recognise the danger and avoid standing or travelling too close to the unstable face.

The W053 symbol is especially useful because signs of instability are not always obvious to someone approaching the area. Weathering, erosion, heavy rainfall, freeze-thaw conditions or previous ground movement can weaken a cliff and create a risk of sudden collapse or falling material.

Using the W053 Unstable Cliff symbol provides a standardised way of warning people about unstable rock or ground conditions. It can support access restrictions, improve awareness and help reduce the risk of injury by encouraging workers, visitors and members of the public to keep clear of hazardous cliff faces.

This symbol is particularly suitable for beaches, coastal swimming areas, surf zones, diving locations and other marine environments where sharks are known or expected to occur. It should be positioned at beach entrances, access points or other prominent locations where people can see the warning before entering the water.

The W054 symbol is especially useful because sharks may not be visible from the shoreline and their presence can change with tides, food sources, migration patterns or local conditions. Clear warning signage helps visitors understand that a potentially dangerous marine animal may be present even when the water appears calm or safe.

Using the W054 Sharks symbol provides a standardised way of warning people about shark hazards in marine environments. It can improve public awareness, support temporary swimming restrictions and help encourage safer decisions where shark activity has been reported or where the risk is considered significant.

This symbol is particularly suitable for beaches, rivers, estuaries, coastal waters, marinas and other locations close to sewage or wastewater discharge points. It should be positioned where people can see the warning before entering the affected water or approaching the outfall area.

The W055 symbol is useful because contamination from an outfall may not always be visible from the surface. Clear warning signage helps people recognise that the water may be unsuitable for swimming, bathing or other recreational activities and encourages them to follow any local restrictions or public-health advice.

Using the W055 Sewage Effluent Outfall symbol provides a standardised way of identifying a potentially contaminated water area. It can improve public awareness, support safer use of beaches and waterways, and help reduce unnecessary exposure to sewage-contaminated water or associated hygiene hazards.

This symbol is particularly suitable for beaches, harbours, coastal roads, low-lying communities and other locations identified as being within a tsunami hazard zone. It should be positioned at access points or along routes where residents, workers and visitors need to be made aware that they are entering an area exposed to tsunami risk.

The W056 symbol is especially important because a tsunami may arrive after an earthquake or warning with limited time available for people to react. Clear signage helps users recognise the hazard zone and encourages them to follow evacuation routes towards designated tsunami evacuation areas, buildings or other places of safety.

Using the W056 Tsunami Hazard Zone symbol provides a standardised way of communicating tsunami risk across coastal environments. It can support public awareness, emergency planning and evacuation procedures while helping people recognise when they should leave vulnerable low-lying areas and move towards a safer location.

This symbol is particularly suitable for rivers, tidal waters, estuaries, beaches, reservoirs and other aquatic locations where strong currents are known to occur. It should be positioned at access points, shoreline areas or other locations where people need to recognise the hazard before entering the water.

The W057 symbol is especially useful because currents may not always be obvious from the surface and can become stronger due to tides, weather or changing water conditions. Clear warning signage helps visitors understand that even apparently calm water may contain forces capable of carrying a person away from a safe area.

Using the W057 Strong Currents symbol provides a standardised way of warning people about hazardous water movement. It can improve awareness, support safer decisions around swimming and water sports, and help reduce the risk of drowning or other incidents caused by unexpectedly powerful currents.

This symbol is particularly suitable for lakes, rivers, marinas, harbours, reservoirs and coastal recreation areas where boats regularly operate. It should be positioned at access points, shoreline areas or other locations where people need to be made aware of boating activity before entering the water.

The W058 symbol is useful because watercraft may approach quickly or from directions that are not immediately obvious to swimmers or other users. Clear warning signage helps people remain alert, keep clear of active boating routes and take additional care when crossing or entering areas used by vessels.

Using the W058 Boating Area symbol provides a standardised way of warning people that boating activity may be taking place nearby. It can support safer sharing of waterways, improve awareness among visitors and help reduce the risk of collisions between boats and other recreational water users.

This symbol is particularly suitable for wide beaches, designated sand-yachting areas, coastal recreation zones and other locations where land yachts are regularly used. It should be positioned at beach entrances, access routes or before people enter the activity area so the hazard is recognised in advance.

The W059 symbol is useful because sand yachts can travel quickly and may approach from directions that pedestrians do not expect. Clear warning signage helps people remain alert, avoid crossing active routes unnecessarily and give operating vehicles sufficient space.

Using the W059 Sand Yachting symbol provides a standardised way of warning visitors about this specific beach activity. It can support safer sharing of coastal spaces, reduce the risk of collisions and reinforce any local access restrictions or operating zones in areas where sand yachting takes place.

This symbol is particularly suitable for beaches, coastal paths, tidal causeways, estuaries, rocky shorelines and other locations where incoming water can isolate people from higher ground or a safe exit route. It should be positioned before entry to the affected area so the warning is seen before people become committed to the route.

The W060 symbol is especially useful because the danger may not be immediately obvious when the tide is low. Water levels can rise steadily and block the return route, leaving people stranded on rocks, sandbanks or between cliffs and the sea. Clear warning signage helps encourage people to check local tide conditions and remain aware of how quickly access can change.

Using the W060 Incoming Tides symbol provides a standardised way of warning people about a time-dependent coastal hazard. It can improve awareness, reduce the risk of people becoming trapped and support safer use of beaches and tidal areas where escape routes may disappear as the water rises.

This symbol is particularly suitable for estuaries, tidal flats, marshland, riverbanks, reservoirs, construction areas and other locations where deep mud or unstable sediment may be present. It should be positioned at access points or before the hazardous area so people are warned before stepping onto the affected ground.

The W061 symbol is especially useful because mud, silt and quicksand can look firm from a distance while becoming unstable when walked on. Clear warning signage helps walkers, workers and visitors recognise the risk of becoming stuck, falling or being unable to move safely out of the area.

Using the W061 Quicksand or Mud / Deep Mud or Silt symbol provides a standardised way of warning people about unstable ground conditions. It can improve awareness, support access restrictions and help reduce the risk of people entering areas where deep mud or silt could lead to entrapment, injury or other serious difficulties.

This symbol is particularly suitable for beaches, coastal recreation areas, lakes and designated watersports zones where kite surfing is regularly carried out. It should be positioned at beach entrances, launching areas or other points where people need to be made aware of the activity before entering the water or crossing the operating area.

The W062 symbol is useful because kite surfers can cover a wide area and their lines may extend a considerable distance from the rider. Clear warning signage helps other users recognise the need to keep a safe distance and reduces the chance of accidental interference with launching, landing or riding.

Using the W062 Kite Surfing symbol provides a standardised way of warning people about an active kite-surfing zone. It can support safer sharing of beaches and waterways, improve awareness among visitors and help reduce the risk of collisions or contact with kite lines and equipment.

This symbol is particularly suitable for beaches, coastal recreation areas, marinas and watersports zones where parasailing is regularly carried out. It should be positioned at access points, shoreline areas or other locations where people need to be made aware of the activity before entering the water or operating nearby.

The W063 symbol is useful because parasailing involves a moving tow vessel, a long tow line and a participant travelling above the water, all of which can present risks to people who are unaware that the activity is taking place. Clear warning signage helps encourage greater awareness and separation from the operational area.

Using the W063 Parasailing symbol provides a standardised way of warning people that parasailing activity may be present. It can support safer management of shared coastal areas, improve awareness among swimmers and other water users, and help reduce the risk of interference with parasailing operations.

This symbol is particularly suitable for exposed coastal locations, mountain areas, elevated walkways, bridges, industrial sites and other places where wind speeds can become hazardous. It should be positioned before people enter the affected area so they have an opportunity to recognise the risk and take appropriate precautions.

The W064 symbol is especially useful where strong winds could cause someone to lose balance or where loose materials, doors, equipment or other objects may move unexpectedly. Clear warning signage helps workers, visitors and members of the public understand that conditions may be less stable or predictable than they appear.

Using the W064 Strong Winds symbol provides a standardised way of warning people about hazardous wind conditions. It can improve awareness in exposed environments, support safer access decisions and help reinforce temporary restrictions or other precautions when high winds create an increased risk of injury.

This symbol is particularly suitable for beaches, coastal paths, surf zones, harbour entrances and other shoreline locations where strong wave action can occur. It should be positioned at beach access points or other prominent locations where people can see the warning before approaching or entering the water.

The W065 symbol is especially useful because sea conditions can change quickly and waves may become much larger or more powerful than they appear from a distance. Clear warning signage helps visitors recognise that entering the water or approaching exposed coastal areas may require additional caution.

Using the W065 High Surf or Large Breaking Waves symbol provides a standardised way of warning people about dangerous wave conditions. It can improve awareness at coastal locations, support safer decisions around swimming and water sports, and help reinforce local restrictions or safety advice when surf conditions are hazardous.

This symbol is particularly suitable for beaches, lakeshores, reservoirs and other natural bathing locations where the underwater ground drops sharply close to the water’s edge. It should be positioned at beach entrances, access points or close to the affected section of shoreline so people see the warning before entering the water.

The W066 symbol is especially useful because a steep underwater slope may not be visible from the shore. Someone entering what appears to be shallow water can quickly find themselves beyond their standing depth, creating a greater risk for weak or inexperienced swimmers and children.

Using the W066 Deep Shelving Beach symbol provides a standardised way of warning people about rapidly increasing water depth near the shore. It can improve awareness of local water conditions, encourage greater caution when entering the water and help reduce the risk of drowning or other incidents caused by an unexpectedly steep seabed.

This symbol is particularly suitable for rivers, lakes, wetlands, coastal waterways, nature reserves and other locations known to contain crocodiles, alligators or caymans. It should be positioned at access points, walking routes, waterside areas or other locations where people could unknowingly enter a habitat used by these animals.

The W067 symbol is especially valuable because crocodilians may remain partly submerged, concealed by vegetation or otherwise difficult to see before someone approaches the water. Clear warning signage helps visitors recognise the potential wildlife hazard and encourages them to maintain a safe distance from the shoreline and follow any local restrictions.

Using the W067 symbol provides a standardised visual warning that can be quickly understood by residents, tourists and other visitors. It can support safer behaviour around natural waterways, reinforce access restrictions and help reduce the risk of dangerous encounters with large crocodilian species.

This symbol is particularly suitable for marinas, pontoons, floating docks, jetties, floating walkways, boarding platforms and other waterside locations where people need to step between surfaces that may move independently. It should be positioned close to the access point so the hazard is recognised before someone steps on or off.

The W068 symbol is especially useful because floating surfaces can shift, rise, fall or move unexpectedly due to waves, tides or the movement of nearby vessels. Clear warning signage helps users anticipate this movement and take greater care when transferring between the floating structure and a fixed surface.

Using the W068 symbol provides a standardised way of warning about a specific fall-into-water hazard. It can improve awareness around marinas and other aquatic facilities, support safer boarding and access procedures, and help reduce the risk of slips, falls and accidental immersion.

This symbol is particularly suitable for beaches, coastal swimming areas, lagoons, marinas, water-sports locations and other aquatic environments where jellyfish are known to occur. It should be positioned at access points, beach entrances or other visible locations where people can see the warning before entering the water.

The W069 symbol is especially useful because jellyfish may be difficult to see and their presence can change with tides, currents or seasonal conditions. Clear warning signage helps visitors recognise that there is a potential marine-life hazard even when the water appears safe.

Using the W069 Jellyfish symbol provides a standardised way of warning people about the risk of jellyfish stings or other harmful contact. It can improve public awareness, support safer use of beaches and aquatic areas, and encourage swimmers to follow any local restrictions or additional safety advice.

This symbol is suitable for stair approaches, thresholds, platforms, raised floors, access routes and other locations where a downward change in level may not be immediately obvious. It should be positioned before the step so pedestrians have enough time to notice the hazard and adjust their movement safely.

The W070 symbol is particularly useful in unfamiliar buildings, poorly lit areas or busy environments where a small change in floor height could easily be overlooked. Clear warning signage helps draw attention to the step and can reduce the likelihood of someone losing balance or falling.

Using the W070 Step Down symbol provides a standardised way of warning about downward floor-level changes. It can improve pedestrian awareness, support safer movement through buildings and help reduce trip and fall accidents where the change in level cannot be removed or made more obvious.

This symbol is particularly appropriate for chemical storage areas, laboratories, industrial plants, manufacturing facilities, warehouses and other workplaces where hazardous substances or mixtures are handled. It should be positioned close to the relevant container, storage location or process so the warning is visible before exposure can occur.

The W071 symbol is useful because some health effects may not be immediately obvious at the time of exposure. Clear warning signage helps employees and contractors recognise that additional controls may be necessary, including avoiding contact, preventing spills and following the appropriate handling procedures for the material.

Using the W071 symbol supports safer chemical handling and helps draw attention to substances that require careful control because of their potential health effects. It provides a standardised ISO 7010 warning that complements GHS hazard classification and can help reinforce storage, handling and exposure-control procedures throughout a workplace.

This symbol is particularly suitable for chemical storage areas, laboratories, industrial facilities, warehouses, waste handling locations and other workplaces where environmentally hazardous substances are stored, handled or transported. It should be positioned close to the relevant container, storage area or process where the risk needs to be clearly identified.

The W072 symbol is useful because environmental harm may occur even when a substance does not present an immediate visible danger to people nearby. Clear warning signage helps workers and contractors recognise that extra care is required to prevent leaks, spills or uncontrolled release into drains, soil, waterways or the wider environment.

Using the W072 symbol supports safer handling and environmental protection procedures by drawing attention to materials that require additional control. It can help reinforce correct storage, spill response and disposal practices while providing a standardised ISO 7010 warning that is consistent with substances or mixtures classified for environmental hazards under the GHS system.

This symbol is particularly suitable for wildfire-prone regions, forested areas, rural communities, industrial zones and other locations where large-scale fires could develop or spread quickly. It may be positioned on access routes, warning boards or temporary signage where people need to be made aware of an elevated fire risk before entering the area.

The W073 symbol is especially useful during periods of extreme heat, drought, strong winds or other conditions that increase the likelihood of a large fire. Clear warning signage helps residents, workers and visitors recognise that conditions may become dangerous quickly and that evacuation instructions should be followed without delay.

Using the W073 Large-scale Fire Zone symbol provides a standardised way of communicating the risk of major fire events. It can support emergency planning, improve public awareness and help reinforce the need for caution, access restrictions or evacuation when a large-scale fire threatens the area.

This symbol is most appropriate in regions where tornadoes are known to occur and may be used on temporary or electronic warning signs, weather alert systems and other safety information displays. It can also be positioned at locations where people need to be made aware of the potential tornado risk before entering or remaining in the area.

The W074 symbol is particularly useful because tornadoes can develop quickly and may give people only limited time to react. Clear warning signage helps residents, workers and visitors recognise that they should remain alert, follow local emergency instructions and be prepared to move to a suitable shelter if conditions deteriorate.

Using the W074 Tornado Zone symbol provides a standardised way of communicating tornado risk and can support emergency preparedness, public awareness and evacuation or shelter procedures. It helps draw immediate attention to the hazard and reinforces the need to take appropriate precautions when severe weather threatens.

This symbol is most appropriate in volcanic regions, national parks, mountain areas, tourist routes and other locations close to active or potentially active volcanoes. It should be positioned on access routes, viewing areas or approach roads where people need to be made aware of the volcanic risk before entering the affected zone.

The W075 symbol is especially useful because volcanic conditions can change rapidly and may create hazards well beyond the immediate crater area. Clear warning signage helps residents, workers and visitors recognise that evacuation, sheltering or other emergency precautions may become necessary if volcanic activity increases.

Using the W075 Active Volcano Zone symbol provides a standardised way of identifying locations exposed to volcanic hazards. It can support public awareness, emergency planning and evacuation procedures while helping people recognise when additional caution is required near an active volcano.

This symbol is most suitable for mountain valleys, steep slopes, ravines, river channels and other locations known to be vulnerable to debris flows or rapid flooding. It may also be displayed along roads, walking routes or access points leading into areas where unstable material could be carried downhill by heavy rainfall.

The W076 symbol is especially important after torrential or prolonged rain, when saturated ground can release large amounts of soil, rock and debris with little warning. Clear signage helps residents, workers and visitors recognise that apparently dry channels or slopes may quickly become hazardous during severe weather.

Using the W076 Debris Flow Zone symbol provides a standardised way of identifying areas exposed to this type of natural hazard. It can improve public awareness, support emergency planning and help reinforce the need for caution, access restrictions or evacuation when conditions increase the risk of debris flow or flash flooding.

This symbol is suitable for riverside areas, floodplains, low-lying land, reservoirs, coastal access points, roads and other locations known to be vulnerable to flooding. It should be positioned before people enter the affected area so they are aware of the risk and can respond to local warnings or restrictions.

The W077 symbol is especially useful because flood conditions can develop quickly following heavy rainfall, storms, overflowing rivers or drainage failure. Clear warning signage helps residents, workers and visitors recognise that an area may become unsafe even when flooding is not immediately visible.

Using the W077 Flood Zone symbol provides a standardised way of identifying locations exposed to flood risk. It can improve public awareness, support emergency planning and help reinforce the need to leave the area promptly when flooding begins or evacuation instructions are issued.

This symbol is particularly suitable for mountainous regions, steep slopes, cuttings, coastal cliffs, construction areas and other locations where soil, rock or debris may become unstable. It may also be used along access routes leading into areas known to be vulnerable to landslide activity.

The W078 symbol becomes especially important following heavy rainfall, storms, earthquakes or other events that can weaken slopes and trigger ground movement. Clear warning signage helps residents, workers and visitors recognise that conditions may have changed and that entering or remaining in the affected area could be dangerous.

Using the W078 Landslide Zone symbol provides a standardised way of identifying areas where slope instability may present a serious hazard. It can support emergency planning, improve public awareness and help direct attention to locations where additional precautions, access restrictions or evacuation measures may be necessary.

This symbol is suitable for boilers, tanks, pressure vessels, process equipment, hot-water systems, industrial pipework and other installations containing heated substances. It should be positioned close to the relevant equipment or access point so that personnel are warned before opening, disconnecting or working on the system.

The W079 symbol is particularly useful because the temperature of material inside a closed system may not be obvious from the outside. Clear warning signage helps maintenance personnel, operators and contractors recognise that hot contents may be present even when the external surface of the equipment does not appear hazardous.

Using the W079 Hot Content symbol provides a standardised warning of a potential burn or scald hazard and supports safer maintenance and operating procedures. It can help prevent accidental contact with released hot media and may be combined with supplementary information identifying the type of content or its temperature where greater detail is required.

This symbol is suitable for boilers, steam pipes, valves, sterilising equipment, process machinery and other installations where hot steam may be discharged during normal operation, venting or maintenance. It should be positioned close to the point of emission or before access to the hazardous area so the warning is seen in advance.

The W080 symbol is particularly useful because escaping steam can be difficult to see clearly and may cause serious burns within a very short time. Clear warning signage helps employees, contractors and maintenance personnel recognise that steam may be released even when the equipment itself appears safe to approach.

Using the W080 Hot Steam symbol provides a standardised way of drawing attention to a scalding hazard associated with steam emissions. It can improve awareness around steam systems, support safer maintenance and operating procedures, and help reduce accidental exposure to high-temperature vapour.

This symbol is particularly suitable for glaciers, snowfields, mountainous areas, alpine routes and other locations where crevasses may be obscured by accumulated snow. It should be positioned on approaches to hazardous areas or routes where people need advance warning before travelling across potentially unstable snow cover.

Crevasses can be extremely difficult to identify when fresh or wind-blown snow covers the surface, and a snow bridge may appear secure despite having little structural strength. The W082 symbol provides a clear visual warning that the terrain cannot be assumed to be safe simply because no opening is visible.

Using the W082 Crevasses Under Snow symbol provides a standardised way of warning people about this concealed mountain and glacier hazard. It can support route management, restricted-access measures and safer decision-making by encouraging people to take additional care or stay away from designated hazardous areas.

This symbol is particularly suitable for ski areas, mountain roads, alpine trails, resorts and other locations where avalanche-prone slopes are present. It should be positioned on approaches to potentially hazardous zones so people are made aware of the danger before entering or travelling through the area.

Avalanches can occur suddenly and conditions may change quickly following heavy snowfall, wind loading, temperature changes or other factors affecting snow stability. The W083 symbol provides a clear visual warning that the surrounding terrain may present an avalanche hazard even when no immediate movement of snow is visible.

Using the W083 Avalanche symbol provides a standardised way of identifying areas where avalanches may occur. It can support temporary closures, route management and other safety measures while helping people recognise when additional caution or avoidance of the affected area may be necessary.

This symbol is particularly suitable for mountain areas, hiking routes, ski resorts, campsites, outdoor recreation areas and other locations where people may have limited access to shelter during severe weather. It should be positioned where users can see the warning before entering an area where thunderstorms could present an increased risk.

Thunderstorms can develop quickly, and lightning may strike well beyond areas of heavy rainfall. Exposed ridges, open ground, elevated locations and areas near isolated structures can become particularly hazardous, making advance warning valuable where thunderstorm activity is a recognised danger.

Using the W084 Thunderstorm symbol provides a standardised visual warning of potentially dangerous storm conditions. It can support temporary closures, evacuation to suitable shelter and safer decision-making by encouraging people to avoid exposed areas when thunderstorms are developing or forecast.

This symbol is particularly suitable for coastal areas, islands, ports, tourist destinations, evacuation routes and other locations exposed to tropical cyclone activity. It can be positioned at approaches to recognised hazard zones or locations where people need advance warning that severe tropical storms are a known risk.

Typhoons, hurricanes and cyclones can develop into highly destructive weather systems capable of damaging buildings, disrupting transport, causing flooding and making outdoor conditions extremely dangerous. The W085 symbol provides a clear visual reminder that people entering the area should be aware of local warnings, evacuation arrangements and emergency procedures.

Using the W085 Typhoon / Hurricane / Cyclone Zone symbol provides a standardised way of identifying locations exposed to tropical cyclone hazards. It can support disaster preparedness, evacuation planning and public awareness while encouraging people to follow official instructions when severe weather threatens the area.

This symbol is particularly suitable for audio equipment, sound systems, headphones, entertainment equipment and other devices or environments capable of producing sustained high sound levels. It can be positioned on equipment, controls or at relevant locations where users need to recognise the risk before prolonged exposure occurs.

Hearing damage can develop gradually, meaning the effects of excessive sound exposure may not be immediately noticeable. The W087 symbol therefore provides an important visual reminder to reduce the volume, limit the duration of exposure or take other appropriate measures to protect hearing.

Using the W087 High Sound Volume Levels symbol provides a standardised way of communicating the risks associated with prolonged exposure to excessive sound. It can reinforce safer listening practices, improve awareness of hearing hazards and help encourage users to avoid extended periods at damaging volume levels.

This symbol is particularly suitable for fans, cutting machines, processing equipment, ventilation systems and other machinery containing exposed or accessible moving blades. It should be positioned close to the danger point or before access to the affected equipment so the hazard is clearly visible.

Moving blades can cause serious injury very quickly, particularly where they continue rotating after equipment has been switched off or where guards have been removed for maintenance. The W088 symbol provides a clear visual reminder not to reach into machinery while blade movement is possible.

Using the W088 Moving Blades symbol provides a standardised way of identifying machinery where moving blades present a cutting or amputation hazard. It can support machine guarding, isolation procedures and safer maintenance practices while helping reduce the risk of accidental contact with dangerous moving parts.

This symbol is particularly suitable for industrial machinery, mechanical drives, conveyors, processing equipment and other installations containing moving gears. It should be positioned close to the hazardous mechanism or at access points where people may come into contact with rotating components.

Moving gears can create powerful pinch and drawing-in points where body parts or loose items may be pulled between meshing teeth. The W089 symbol provides an immediate visual warning to avoid reaching into machinery and to ensure suitable isolation or guarding is in place before maintenance or inspection work begins.

Using the W089 Moving Gears symbol provides a standardised way of identifying machinery where rotating gears present a trapping or entanglement hazard. It can support machine-guarding measures, safer maintenance procedures and improved awareness of mechanical risks while helping reduce the likelihood of serious hand or finger injuries.