# Mark I

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"MK 1" redirects here. For the first Mario Kart title, see [Super Mario Kart](/source/Super_Mario_Kart).

**Mark I** or **Mark 1** often refers to the first version of a weapon or military vehicle, and is sometimes used in a similar fashion in civilian product development. In some instances, the [Arabic numeral](/source/Arabic_numerals) "1" is substituted for the [Roman numeral](/source/Roman_numerals) "I". "Mark", meaning "model" or "variant", can itself be abbreviated "Mk." It may refer to:

## Military and weaponry

- [Mark I tank](/source/Mark_I_tank) (1916), the first tank to be used in combat
- [Mk 1 grenade](/source/Mk_1_grenade), the first American-designed grenade used by American forces in World War I
- [Mark I trench knife](/source/Mark_I_trench_knife), a combat knife carried by US forces after World War I
- [Supermarine Spitfire Mk I](/source/Supermarine_Spitfire_variants_part_one#Mk_I_(Type_300)) (1938), Royal Air Force fighter aircraft
- [Mark I Fire Control Computer](/source/Mark_I_Fire_Control_Computer), United States Navy fire control computer used in World War II surface ships
- [Mark I Nuclear Weapon (Little Boy)](/source/Little_Boy), first nuclear weapon used in combat
- The [Mark I NAAK](/source/Mark_I_NAAK), an auto-injector carried by military personnel for use in case of nerve agent attacks
- [Patrol Boat, River](/source/Patrol_Boat,_River) ("Mark I PBR", 1966), 31-foot version of the US Navy riverine patrol boat
- [Mk 1 Underwater Defense Gun](/source/Mk_1_Underwater_Defense_Gun), 1970s United States Navy dart-shooting underwater firearm
- [Mark 1](/source/Frankenburg_Mark_1), counter-drone micromissile developed by [Frankenburg Technologies](/source/Frankenburg_Technologies)

## Vehicles

- [Mk I Mini](/source/Mk_I_Mini) (1959-1967); the original Austin Mini and Morris Mini-Minor from British Motor Corporation
- [British Railways Mark 1](/source/British_Railways_Mark_1), the first standardised passenger-rated rolling stock (carriages or cars), introduced on British Railways in the 1950s
- [UTDC ICTS Mark I](/source/Innovia_Metro#Delivered_rolling_stock_and_systems), rolling stock used by the [Vancouver SkyTrain](/source/SkyTrain_(Vancouver)) and [Detroit People Mover](/source/Detroit_People_Mover), as well as formerly in [Line 3 Scarborough](/source/Toronto)
- [Aptera Mk-1](/source/Aptera_Motors#Aptera_Mk-0_and_Mk-1/Typ-1), a prototype 3-wheeled autocycle car replacement

## Computers

- [Harvard Mark I](/source/Harvard_Mark_I) (1944), an early automatic digital computer made by IBM
- [Colossus Mark I](/source/Colossus_Mark_I) (1944), a British computer used to crack military codes
- [Manchester Mark 1](/source/Manchester_Mark_1) (1949), an early Autocode computer
- [Ferranti Mark 1](/source/Ferranti_Mark_1) (1951), an early computer based on the Manchester Mark 1
- MARK 1 or [Perceptron](/source/Perceptron) (1959-1960), a neural net computer designed by Frank Rosenblatt at Cornell University

## Other technologies

- [Mark I (detector)](/source/Mark_I_(detector)), a particle detector at Stanford Linear Accelerator Center from 1973 to 1977
- [GE BWR](/source/GE_BWR) Mark I boiling water reactor, a Generation II nuclear reactor
- The [Lovell Telescope](/source/Lovell_Telescope), called the Mark I between 1961 and 1970, then the Mark IA between 1971 and 1987

## Other uses

- [Mark 1](/source/Mark_1) or Mark I, the first chapter of the Gospel of Mark in the New Testament of the Christian Bible
- [Patriarch Mark I](/source/Patriarch_Mark_I), retronym for Mark the Apostle as Patriarch of Alexandria
- "Mark I" or "Mark 1", the working title of "[Tomorrow Never Knows](/source/Tomorrow_Never_Knows)," a song by the Beatles
- [Visual inspection](/source/Visual_inspection), sometimes called "Mark I Eyeball" in US Military slang since the 1950s
- [Mesa Boogie Mark I](/source/Mesa_Boogie_Mark_Series#Mark_I) (1969), an electric guitar amplifier
- Mark I, first version of [Iron Man's armor](/source/Iron_Man's_armor)
- Mark I line-up of rock band [Deep Purple](/source/Deep_Purple), the band's original line-up, with Rod Evans, Ritchie Blackmore, Jon Lord, Nick Simper and Ian Paice

## See also

- [Mark One (disambiguation)](/source/Mark_One_(disambiguation)), including Mk.one
- [MK1 (disambiguation)](/source/MK1_(disambiguation))
- [MKI (disambiguation)](/source/MKI_(disambiguation))

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Adapted from the Wikipedia article [Mark I](https://en.wikipedia.org/wiki/Mark_I) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Mark_I?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.