SM9 may refer to:
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SM9 (classification), a swimming disability category
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SM9 (cryptography standard), a Chinese national cryptography standard
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SM-9
The STEN (or Sten gun) is a family of British submachine guns chambered in 9×19mm which were used extensively by British and Commonwealth forces throughout World War II and the Korean War. They had a simple design and very low production cos ...
, a machine gun
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