Which class of fire extinguisher is indicated by a yellow star?

A yellow star indicates a Class D fire extinguisher, which is specifically designed for fires involving combustible metals. These fires can be particularly challenging to extinguish due to the intense heat and the unique reaction of metals to water and certain types of agents.

Class D extinguishing agents work by smothering the fire and interrupting the chemical reaction that sustains it. They may use dry powder agents that are effective against specific metal fires, such as magnesium, sodium, or potassium.

Class A extinguishers are for ordinary combustible materials like wood, cloth, and paper; Class C extinguishers are for electrical fires; and Class K extinguishers are specifically aimed at cooking oils and grease. Each of these classes features a different symbol, making it crucial for first responders or anyone using fire extinguishers to recognize which type of extinguisher is appropriate for the specific hazard they face.