What does that safety sign mean?

Start with the shape and color. Find the sign family below, then browse its symbols to match the picture you see.

Warning

Yellow · Triangle

Yellow triangular signs draw attention to a hazard, such as electricity, moving machinery, or a hot surface.

A warning pictogram does not state the severity, safe distance, or protective measures. Read the accompanying instructions.

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Prohibition

Red · Circle with a diagonal bar

Red circular signs with a diagonal bar identify an action that must not be taken in the marked area.

Check what object or action the symbol prohibits. A prohibition sign does not identify all the hazards in an area.

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Mandatory action

Blue · Circle

Blue circular signs communicate an action, such as wearing eye protection or following a specified procedure.

A pictogram does not select the grade of PPE or explain a complete procedure. Use the task-specific instructions.

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Safe condition

Green · Square or rectangle

Green square or rectangular signs identify emergency escape routes, safety facilities, and rescue equipment.

Follow the complete wayfinding system and local emergency plan. A symbol alone does not establish a safe route.

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Fire equipment

Red · Square or rectangle

Red square or rectangular signs identify fire equipment and manual alarm points.

Finding equipment does not mean it is suitable or safe to use. Follow your training and the site emergency procedure.

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Chemical hazards

Red border · Diamond

GHS pictograms use a black symbol on white within a red diamond border to communicate chemical hazard classes.

Read the whole label and safety data sheet. A pictogram can cover several hazards and does not specify controls by itself.

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NFPA 704

Blue, red, yellow, white · Four-part diamond

The NFPA 704 diamond shows health, flammability, instability, and special hazards for emergency response.

Ratings depend on the material and its properties. Do not copy GHS category numbers into the diamond.

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Identify the complete message

Check the shape, color, and pictogram together. Color alone is not enough.
Read nearby wording and directional arrows.
Match the exact symbol and code in the reference library.
Use the site procedure or chemical safety data sheet to determine the action to take.

These categories cover this library's ISO 7010, GHS, and NFPA 704 references. They do not cover every road sign, transport placard, or product marking.

Sources: ISO 7010, OSHA pictograms, and OSHA/NFPA label comparison.