A fire extinguisher indicating a Class K fire has which color shape?

A fire extinguisher designated for Class K fires is identified by a black hexagon. Class K fires specifically refer to fires that involve cooking oils and greases, commonly found in commercial kitchen settings. The use of a black hexagon for these extinguishers helps to quickly distinguish them from those used for other types of fires, which can be crucial in an emergency. The black color is not only recognizable but also standardized in fire safety regulations to ensure that individuals can respond effectively in a high-stress environment.

This specific color and shape combination aids in promoting safety and readiness by ensuring that firefighters and others involved in emergency response can quickly identify and use the appropriate extinguisher. The other shapes and colors correspond to extinguishers for different classes of fires, which is why they are not applicable for Class K.