Signage (Warning / Prohibitor / Mandatory). Warning Signs: triangle, black on yellow, black border — warn of hazards.
Prohibitor Signs: red circle with oblique on white — prohibit risky behavior.
Mandatory Signs: blue circle, white pictogram — actions required to safeguard health and avoid injury.”
Spot the shape, know the action: triangle warns, red circle forbids, blue circle instructs. Follow signs immediately.”