M51

M51 or M-51 may refer to:

  • M-51 (Michigan highway), a state highway in Michigan
  • M51 highway (Russia)
  • M51 (Cape Town), a Metropolitan Route in Cape Town, South Africa
  • M51 Skysweeper, an anti-aircraft gun
  • M51 MACI mine
  • M51 SLBM, a French nuclear ballistic missile
  • BMW M51, a 1991 straight-6 Diesel engine
  • Sherman M-51, an Israeli modification of American M4 Sherman tank
  • Eidgenössischer Stutzer 1851, a historical service rifle of the Swiss Army
  • Messier 51, a spiral galaxy also known as the Whirlpool Galaxy
  • Samsung Galaxy M51, a smartphone released in 2020
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