What type of fire extinguisher is used for extinguishing a fire caused by a combustible metal like aluminum?

A fire extinguisher marked with a Yellow Five-pointed Star around the letter D is specifically designed for handling fires caused by combustible metals such as aluminum, magnesium, and titanium. These types of fires are classified as Class D fires. The unique composition of the materials involved requires special extinguishing agents that can effectively smother and cool the flames without reacting with the metal.

Using the incorrect type of extinguisher can exacerbate the fire or cause dangerous reactions. For example, an extinguisher marked with a Red Square around the letter B is meant for combustible liquids, while a Blue Circle around the letter C indicates suitability for electrical fires. Thus, using these types of extinguishers on metal fires would not only be ineffective but could also pose safety risks.

A fire extinguisher with a Yellow Five-pointed Star around the letter D is therefore crucial for safely combating those specific hazards associated with combustible metals, making it the correct choice for the question provided.