Victory marking
A victory marking (also called a victory mark, kill marking, or kill mark, or mission symbol) is a symbol applied in stencil or decal to the side of a military aircraft, ship or ground vehicle to denote a victory achieved by the pilot or crew against an aerial target. The use of victory markings originated during World War I, burgeoned during World War II and frequently took the form of the roundel or national flag of the nationality of the military target defeated.