What does a fire extinguisher marked with a "C" signify?

A fire extinguisher marked with a "C" signifies that it is designed for use on Class C fires, which involve electrical equipment. This classification is important because using the wrong type of extinguisher on an electrical fire can lead to dangerous situations. Class C extinguishers typically use non-conductive agents that can effectively cool and smother the flames without conducting electricity, thus minimizing the risk of shock or further ignition. This is crucial when dealing with electrical fires, as water and certain other extinguishing agents can conduct electricity and pose greater hazards. The clear labeling system helps firefighters and individuals quickly identify the appropriate extinguisher for the type of fire they are facing, ensuring safety and effectiveness in emergency situations.