Military aircraft insignia, such as that of the Philippine Air Force and the Polish szachownica, are often called roundels even when they are not round.

Military aircraft insignia are insignia applied to military aircraft to identify the nation or branch of military service to which the aircraft belongs.

Some spotters will note and compile the markings, a Military aircraft insignia or airline livery or logo perhaps, a squadron badge or code letters in the case of a military aircraft.