The acronym ZSU stands for Zenitnaya Samokhodnaya Ustanovka (Russian: ÃâõýøÃâýðàáðüþÃâ¦Ã¾Ã´Ã½Ã°Ã Ã£ÃÂÃâðýþòúð), meaning anti-aircraft self-propelled mount; the 23 signifies the bore diameter in millimeters; the 4 signifies the number of gun barrels. It is named after the Shilka River in Russia. Afghan soldiers nicknamed it the sewing machine due to the sound of firing guns. It is also referred to by its nickname of Zeus. Its not a tank ! This one is at the Muckleburgh Military Collection in Norfolk England
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