21 Important safety signs & symbols and their meanings

21 Important safety signs & symbols and their meanings
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Important safety signs & symbols and their meanings

Safety Symbols are labels portraying graphics set forth by the International Standards Organization (ISO) which are recognized internationally. This helps ensure the dangers present are understood by an increasingly multi-lingual workforce. The shapes and colours of the safety symbols distinguish the hazard type or hazard instruction.

These Safety symbols are divides into four (4) categories:

  1. Prohibition Symbols:


Large Rectangular

The prohibition symbols gives information about a dangerous behaviour, Stop, Shutdown, Emergency cut-out devices or evacuate. Round shaped with a black pictogram on white background or red edging with a red diagonal line.


2. Warning Symbols

Warning sign has a yellow background. It tell you to be careful, to take precautions, and also warns about nearby hazards. The sign do has a triangular shape, black pictogram on yellow background and black edging.


3. Mandatory sign

Mandatory sign tells you about a specific behavior or action. It’s always round in shape with white pictogram on blue background.


4. Emergency sign

Emergency sign always have a green background pasted on doors, exits, escape routes, equipment and facilities, etc. It is rectangular or square shape with white pictogram on green background.



We have successfully group the safety symbols into their various categories, now I will enumerate some important safety symbols you should know in order to stay protected from hazards.




Serious Health Hazard





Oxidizing Agent





Gas Under Pressure















Tripping Hazard



Toxic Material




Pinch Point



No Forklift Truck




No Admittance



Nose Mask required



Low Temperature




Heated/Hot Surface



Face Shield and Eye Protection Required



Eye and Eye Protection Required







High Voltage





Foot Protection Needed





Emergency Exit








Emergency Stair Way



Emergency Assembly Point





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