Mark IV
Mark IV or Mark 4 often refers to the fourth version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk." Mark IV or Mark 4 may refer to: == Computers == MARK IV (software), a 1960s-era 4th-generation programming language from Informatics Harvard Mark IV (1952), an all-electronic stored-program computer ETL Mark IV computer, a transistorized computer built at the ElectroTechnical Laboratory in Japan Emergency Medical Hologram Mark IV, in Star Trek: Voyager, an artificially intelligent medical program == Music == The Mark IV, American vocal group, 1950s The Mark Four (1966–1968), an English band MARK IV (Barbershop), a barbershop quartet that won the 1969 SPEBSQSA competition Mesa Boogie Mark IV (1993–2008), an electric guitar amplifier Disklavier § Mark IV, a reproducing piano sold by Yamaha Corporation Mark IV line-up of rock band Deep Purple, their fourth line-up, with David Coverdale, Tommy Bolin, Jon Lord, Glenn Hughes and Ian Paice == Religion == Mark 4 or Mark IV, the fourth chapter of the Gospel of Mark in the New Testament of the Bible Patriarch Mark IV of Alexandria, Greek patriarch of Alexandria in 1385–1389 Pope Mark IV of Alexandria (died 1363), Coptic Pope in 1348–1363 == Vehicles == Mark 4 (Iarnród Éireann), Irish Rail InterCity train Mark IV monorail, train used at Walt Disney World, 1971–1989 Mark IV tank, an up-armoured variant of the British Mark I tank, 1917 Bristol Blenheim Mk.IV, light bomber in Royal Air Force service before and during World War II British Rail Mark 4, passenger train Chandelle Mk IV, ultralight aircraft Cozy MK IV, an experimental 4 place canard aircraft derived by Nat Puffer from the Burt Rutan Long-EZ Jaguar Mark IV (1945–1949), British car Continental Mark IV (1959, 1972–1976), American luxury car Merkava Mark IV (1999), main battle tank of Israel Defense Forces Triumph Spitfire, MKIV (1970–1974), a British sports car == Weapons == Webley Mk IV, a.k.a.