The main categories of safety sign are:

warning signs - for hazards such as flammable materials

prohibition signs - prohibiting certain actions such as smoking

mandatory signs - telling people that they must do something such as wearing hearing protection

safe condition signs - giving information about safety features such as fire exits

Fire-fighting signs - giving information on fighting fires

Warning Signs

Shape - Triangular
Background - Yellow
Pictogram - Black
Border - Black

Biological Risk	Corrosive Material	Drop
Danger - Electricity	Explosive Material	Flammable Material or High Temperature
General Danger	Harmful or Irritant Material	Laser Beam
Low Temperature	Strong Magnetic Field	Non-ionising Radiation
Obstacle	Overhead Load	Oxidant Material
Radioactive material	Toxic Material	Industrial Vehicles

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Prohibition Signs

Shape - Circular
Background - White
Pictogram - Black
Border - Red with Diagonal Line

No Access for Unauthorised Person	Not Drinking Water	No Smoking or Naked Flames
No Smoking	No Pedestrians	No Running
Do Not Touch	No Industrial Vehicles	Do Not Extinguish With Water

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Mandatory Signs

Shape - Circular
Background - Blue
Pictogram and writing - White

Hard Hat Area	Keep The Workplace Tidy	Switch Off When Not In Use
Wear Ear Protectors	Wear Safety Goggles	Fire Escape - Keep Clear
Wear Protective Footwear	Wear A Hairnet	Keep Locked
Keep Out	Wash Your Hands	Guards Must Be In Position Before Starting

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Safe Condition Signs

Shape - Rectangular
Background - Green
Pictogram and writing - White

Slide to Open	Safe to Drink Water From This Tap	Emergency Eye-Wash Station
Permitted Smoking Area	Fire Exit Through This Door	Push Bar On This Door To Open
First Aid	Fire Exit	Emergency Shower Station

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Fire-fighting Signs

Shape - Rectangular or Square
Background - Red
Pictogram and writing - White

Fire Extinguisher	Fire Alarm	Fire Hose