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 Arabic numerals are the ten numerical digits: , , , , , , , , and . They are the most commonly used symbols to write decimal numbers. They are also used for writing numbers in other systems such as octal, and for writing identifiers such as ...

"1" is substituted for the

Roman numeral Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers are written with combinations of letters from the Latin alphabet, ea ...

"I". "Mark", meaning "model" or "variant", can itself be abbreviated "Mk."

Military and weaponry

Mark I tank British heavy tanks were a series of related armoured fighting vehicles developed by the UK during the First World War. The Mark I was the world's first tank, a tracked, armed, and armoured vehicle, to enter combat. The name "tank" was initial ...

(1916), the first tank to be used in combat * Supermarine Spitfire Mk I (1938), Royal Air Force fighter aircraft *

Mark I Fire Control Computer The Mark 1, and later the Mark 1A, Fire Control Computer was a component of the Mark 37 Gun Fire Control System deployed by the United States Navy during World War II and up to 1991 and possibly later. It was originally developed by Hannibal C. ...

, United States Navy fire control computer used in World War II surface ships * Mark I Nuclear Weapon (Little Boy), first nuclear weapon used in combat *The

Mark I NAAK In the United States military, the Mark I NAAK, or MARK I Kit, ("Nerve Agent Antidote Kit") is a dual-chamber autoinjector: Two anti-nerve agent drugs— atropine sulfate and pralidoxime chloride—each in injectable form, constitute the kit. ...

, an auto-injector carried by military personnel for use in case of nerve agent attacks *

Mk 1 Underwater Defense Gun The M1 Underwater Defense Gun, also called the Underwater Defense Gun Mark 1 Mod 0, is an underwater firearm developed by the United States during the Cold War. Similar to other underwater firearms, it fires a special metal dart as its projecti ...

, 1970s United States Navy dart-shooting underwater firearm * Mk 1 grenade, the first American-designed grenade used by American forces in World War I *

Mark I trench knife The Mark I trench knife is an American trench knife designed by officers of the American Expeditionary Force The American Expeditionary Forces (A. E. F.) was a formation of the United States Army on the Western Front of World War I. The A ...

, a combat knife carried by US forces after World War I *

Patrol Boat, River Patrol Boat, Riverine, or PBR, is the United States Navy designation for a small rigid-hulled patrol boat used in the Vietnam War from March 1966 until 1975. They were deployed in a force that grew to 250 boats, the most common craft in the ...

("Mark I PBR", 1966), 31-foot version of the US Navy riverine patrol boat

Vehicles

* Mk I Mini (1959-1967); the original Austin Mini and Morris Mini-Minor from British Motor Corporation * 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, rolling stock used by Vancouver SkyTrain rapid transit

Other technologies

*MARK 1 or

Perceptron In machine learning, the perceptron (or McCulloch-Pitts neuron) is an algorithm for supervised learning of binary classifiers. A binary classifier is a function which can decide whether or not an input, represented by a vector of numbers, belon ...

(1959-1960), a neural net computer designed by Frank Rosenblatt at Cornell University * Mark I (detector), a particle detector at Stanford Linear Accelerator Center from 1973 to 1977 *

Colossus Mark I Colossus was a set of computers developed by British codebreakers in the years 1943–1945 to help in the cryptanalysis of the Lorenz cipher. Colossus used thermionic valves (vacuum tubes) to perform Boolean and counting operations. Colossus ...

(1944), a British computer used to crack military codes *

Ferranti Mark 1 The Ferranti Mark 1, also known as the Manchester Electronic Computer in its sales literature, and thus sometimes called the Manchester Ferranti, was produced by British electrical engineering firm Ferranti Ltd. It was the world's first commer ...

(1951), an early computer based on the Manchester Mark 1 *

GE BWR General Electric's BWR product line of boiling water reactors represents the designs of a relatively large (~18%) percentage of the commercial fission reactors around the world. The progenitor of the BWR line was the 5 MW Vallecitos Boiling Wat ...

Mark I boiling water reactor, a Generation II nuclear reactor * Harvard Mark I (1944), an early automatic digital computer made by IBM *The

Lovell Telescope The Lovell Telescope is a radio telescope at Jodrell Bank Observatory, near Goostrey, Cheshire in the north-west of England. When construction was finished in 1957, the telescope was the largest steerable dish radio telescope in the world at ...

, called the Mark I between 1961 and 1970, then the Mark IA between 1971 and 1987 *

Manchester Mark 1 The Manchester Mark 1 was one of the earliest stored-program computers, developed at the Victoria University of Manchester, England from the Manchester Baby (operational in June 1948). Work began in August 1948, and the first version was oper ...

(1949), an early Autocode computer * Mesa Boogie Mark I (1969), an electric guitar amplifier designed in Northern California

Other uses

Mark 1 Mark 1 is the first chapter of the Gospel of Mark in the New Testament of the Christian Bible. Text The original text was written in Koine Greek. This chapter is divided into 45 verses. Textual witnesses Some early manuscripts conta ...

or Mark I, the first chapter of the Gospel of Mark in the New Testament of the Christian Bible *

Visual inspection Visual inspection is a common method of quality control, data acquisition, and data analysis. Visual Inspection, used in maintenance of facilities, mean inspection of equipment and structures using either or all of raw human senses such as vision, ...

, sometimes been called Mark I Eyeball in the US Military since the 1950s *

Patriarch Mark I Mark the Evangelist ( la, Marcus; grc-gre, Μᾶρκος, Mârkos; arc, ܡܪܩܘܣ, translit=Marqōs; Ge'ez: ማርቆስ; ), also known as Saint Mark, is the person who is traditionally ascribed to be the author of the Gospel of Mark. Accor ...

, retronym for Mark the Apostle as Patriarch of Alexandria *

Iron Man's armor Iron Man's armor is a fictional, powered exoskeleton appearing in American comic books published by Marvel Comics. It is built and worn by billionaire Iron Man#Fictional character biography, Tony Stark when he assumes the identity of the superhe ...

Military and weaponry

Vehicles

Other technologies

Other uses

See also