Safety signs fall into five categories 1.Prohibitive 2.Warning 3.Mandatory 4.Emergency or First Aid 5.Fire Fighting signs

Prohibitive Signs Used to prevent an action where there is danger Round shape Black pictogram White background Red edge with a diagonal line

Warning Signs Warn of danger and for precautions and/or care to be taken to prevent harm. Triangular Yellow background with black edging.

Mandatory Signs Require that specified actions are to be followed. Associated with wearing protective equipment. Round shape. Blue background

Emergency or First Aid Provide directions as to the nearest escape route. Rectangular or square White pictogram Green Background

Fire Fighting Signs Used to identify and locate fire fighting equipment. Rectangular or square. White pictogram on red background.