What symbol on a fire extinguisher indicates that it must not be used?

The symbol that indicates a fire extinguisher must not be used is represented by a shaded background with a slash. This visual cue is commonly used to provide an immediate warning to individuals about specific hazards or restrictions associated with the use of the extinguisher. The shaded background serves to catch attention, while the slashing line clearly communicates the prohibition.

This kind of symbol is crucial in various emergency situations, as it quickly informs responders that the extinguisher might not be appropriate for the type of fire or could even pose additional risks. Understanding these symbols is part of ensuring safety and appropriate response procedures in case of fire emergencies, making them vital knowledge for anyone working in environments with fire safety protocols.

In contexts where fire safety is essential, recognizing these indications helps to maintain safety and prevent further hazards from emerging during an emergency.