The term 'TANK REVOLVER' is a combination of two words, 'TANK' and 'REVOLVER'. TANK refers to a large, heavily armored military vehicle, while REVOLVER is a type of handgun with a revolving cylinder that holds multiple rounds of ammunition. Together, the two words refer to a type of TURRET-mounted gun that is used on tanks. This type of weapon is designed to provide a high rate of fire and is typically used for anti-aircraft or anti-personnel purposes.