The ZSU-57-2 Object 500 is a Soviet self-propelled anti-aircraft gun (SPAAG), armed with two 57 mm autocannons. 'ZSU' stands for Zenitnaya Samokhodnaya Ustanovka, meaning "anti-aircraft self-propelled mount", '57' stands for the bore of the armament in millimeters and '2' stands for the number of gun barrels. It was the first Soviet mass-produced tracked SPAAG. In the USSR, it had the unofficial nickname Sparka, meaning "twin mount," referring to the twin autocannon with which the vehicle is armed.
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