Used for the most extreme hazards that will result in death or serious injury if not avoided, such as high voltage or hazardous machinery.

: Durable, adhesive-backed vinyl circles used to mark forklift paths or "Do Not Block" areas near fire extinguishers.

: Often made of laminated vinyl or polyester to resist heat, oil, and chemicals, these are placed near moving parts and pinch points.

Marks potential hazards that may lead to minor or moderate injuries, like "Watch Your Step" or "Pinch Point" warnings.

Signs are categorized by their purpose and level of danger, often identified by their header color: