M11 or M-11 may be: In science:Messier 11 (M11), an open star cluster also known as the Wild Duck ClusterM11, one of the five Mathieu groups in the mathematical field of group theoryIn transportation:M11 motorway, a motorway in EnglandM-11 (Michigan highway), a state highway in the metropolitan area of Grand Rapids, MichiganIn firearms and military equipment:M11, a United States military designation for the Sig P228 semi-automatic pistolFiat M11/39, a Italian medium tank used during World War IIRemington 11-87, a semi-automatic shotgun
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