A6M
The Mitsubishi A6M Zero was a lightweight fighter aircraft operated by the Imperial Japanese Navy Air Service (IJNAS) from 1940 to 1945. The origin of its official designation was that "A" signified a fighter and "6" for the sixth model built by Mitsubishi ("M"). The A6M was usually known to the Allied militaries as the "Zero" — a name that was frequently misapplied to other Japanese fighters, such as the Nakajima Ki-43-II — as well as other codenames and nicknames, including "Zeke", "Hamp" and "Hap".