What does CODE 10 stand for?

Fire

Fire is the result of a combination of three factors; a substance that burns, an ignition source, and a supply of oxygen. Fires are divided into three categories, according to the material involved: Class A-solid materials extinguished by cooling below their flash point, Class B -oils and inflammable liquids extinguished by smothering to exclude oxygen, Class C-electrical equipment extinguished by non-conductive agents such as dry powder.