M51

M51 or M-51 may refer to:

M-51 (Michigan highway), a state highway in Michigan
M51 SLBM, a French nuclear ballistic missile
BMW M51, a 1991 straight-6 Diesel engine
Eidgenössischer Stutzer 1851, a historical service rifle of the Swiss Army
Messier 51, a spiral galaxy also known as the Whirlpool Galaxy

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