M4

M4 or M-4 may refer to:

In computers:

• m4 (computer language), a macro processing language
• GNU m4, the GNU version of the m4 language

In firearms and military equipment:

• M4 Carbine, an assault rifle
• M4 Sherman, the primary tank used by the Americans in World War II
• Benelli M4 Super 90, a combat shotgun
• M2/M4 Selectable Light-weight Attack Munition (SLAM), a land mine
• M4 (cipher), a variant of the Enigma machine
• M4 flame fuel thickening compound, a substance used in fire bombs and incendiary weapons
• Myasishchev M-4, a Soviet strategic bomber
• M4 SLBM, a French submarine-launched ballistic missile
• Spectre M4, a submachine gun

In science:

• Messier 4 (M4), a globular cluster in the constellation Scorpius

In transportation:

• Metroad 4 (M4), a metroad in Sydney, Australia
• M4 Western Motorway, a segment of Metroad 4 in central Sydney, Australia
• M4 motorway, a motorway in the United Kingdom that links London with South Wales
• M4 motorway, a motorway-grade section of the N4 road in the Republic of Ireland
• M-4 (Michigan highway), a former designation for the M-134 and M-10 Michigan state highways
• M4 motorway (Russia), another name for the Don Highway in Russia
• M4 motorway (Pakistan), a proposed motorway for Pakistan
• M4 Vacamatic, a semi-automatic transmission made by Chrysler

In rail:

• M4, the fourth line of Budapest Metro, Hungary
• M4 Line, part of the Bucharest Metro, Romania
• M4, a subway car; 220 were delivered to SEPTA by Adtranz in 1999-2000

In aircraft :

• Miles M.4 Merlin, a 1930s British five-seat cabin monoplane

In hardware:

• M4 screw, a metric screw

In economics:

• M4 money supply, the total amount of money in bank accounts and in circulation in the United Kingdom

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