Answer:
The letters on a fire extinguisher label indicate the types of fires the extinguisher can be used to put out. For example, "A" is for ordinary combustibles like paper and wood, "B" is for flammable liquids like oil and gasoline, and "C" is for electrical equipment. If a fire extinguisher has multiple letters on it, it means it can be used on multiple types of fires.
Explanation:
When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance. The symbol "Δ" is often used to indicate that the reaction is to be heated.
