Mark XVIII or Mark 18 often refers to the 18th version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk."
Mark XVIII or Mark 18 may refer to:
Technology
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De Havilland Mosquito NF Mk XVIII; a Royal Air Force night fighter radar modification
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De Havilland Mosquito FB Mk XVIII, also called ''Tsetse''; RAF ground-attack aircraft carrying a QF 6-pounder (57 mm) anti-tank gun
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Supermarine Spitfire Mk 18; a further development of the Mk XIV, arriving too late to serve in World War II
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Mark 18 torpedo
The Mark 18 torpedo was an electric torpedo used by the United States Navy during World War II. The Mark 18 was the first Battery (electricity), electric storage battery torpedo manufactured for the US Navy and it was designed primarily for use ...
, 1944 US Navy electric torpedo
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Mark 18 nuclear bomb
The Mark 18 nuclear bomb, also known as the SOB or Super Oralloy Bomb, was an American nuclear bomb design which was the highest yield fission bomb produced by the US. The Mark 18 had a design yield of 500 kilotons. Nuclear weapon designer Ted ...
; 1953 American nuclear bomb
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CQBR
The Close Quarter Battle Receiver (CQBR) is a replacement upper receiver for the M4A1 carbine developed by the US Navy.
The CQBR features a length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the we ...
Mark 18 Mod 0; a modification of the M4 Carbine
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Mk 18 Mod 0 grenade launcher
The Mk 18 Mod 0 was a 40x46mm grenade launcher used by the United States Navy during the Vietnam War and also the last known hand crank operated firearm since the Gatling gun. It was replaced by the Mk 19 grenade launcher in service with the U ...
; former US Navy grenade launcher
Other uses
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Bolo ''Gladius'' model XVIII, artificially intelligent tank imagined by author Keith Laumer
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