F4

F4, F.IV, F04, F 4, F.4 or F-4 may refer to:

Aircraft

• Flanders F.4, a 1910s British experimental military two-seat monoplane aircraft
• Martinsyde F.4 Buzzard, a British World War I fighter version of the Martinsyde Buzzard biplane
• Fokker F.IV, a 1921 Dutch airliner
• Caproni Vizzola F.4, an Italian prototype fighter of 1939
• Lockheed F-4 Lightning, a reconnaissance variant of the Lockheed P-38 Lightning World War 2 fighter
• A number of aircraft that first entered service with the U.S. Navy:
  • Curtiss F4C, a 1920s version of the Naval Aircraft Factory TS biplane fighter
  • Boeing F4B, a 1930s version of the Boeing P-12 biplane fighter
  • Grumman F4F Wildcat, a carrier-based fighter aircraft in World War 2
  • Vought F4U Corsair, a World War 2 fighter
  • Douglas F4D Skyray, a carrier-based fighter/interceptor, first flight 1951
  • McDonnell Douglas F-4 Phantom II, a supersonic fighter-bomber, first flight 1958

Art, entertainment, and music

• F4 (company), formerly F4-Toys, a French video game developer
• F4, or Flower 4, the four handsome boys appearing in Boys Over Flowers
• F4 (band), Taiwanese boy band
• F₄, Middle F

Computing and technology

• Faugère's F4 algorithm in computer algebra
• F4, a function key on a computer keyboard
• f4transkript, a transcription software

Mathematics

• F₄ (mathematics), the name of a Lie group and also its Lie algebra f₄
• F₄, Fermat number

Sports and games

• Formula 4, a class of car racing
• f4, designates a square in Algebraic notation
• 1. f4, or Bird's opening, an opening move in chess

Transportation and vehicles

• F4 Darling Harbour ferry service, Sydney, Australia
• F4, Front-engine, four-wheel-drive layout in automotive design
• MV Agusta F4 series, a series of motorcycles
• Saginaw Airport (FAA identifier F04), a defunct public airport in Fort Worth, Texas, U.S.
• USS F-4 (SS-23), a United States submarine that sunk near Honolulu harbor in 1915

Other uses

• F4, a paper size
• F 4 Frösön, a former Swedish Air Force wing
• f/4, an f-number of an optical system such as a camera lens
• F-4 Object, or Rákosi bunker, a formerly secret nuclear shelter in Budapest, Hungary
• Form F-4, an American form used to register securities
• Nikon F4, a camera
• F4, Albarka Air's IATA airline designator
• F4, a tornado intensity rating on the Fujita scale
• F04, ICD-10 code for organic amnesic syndrome, not induced by alcohol and other psychoactive substances
• F4: an electrode site according to the 10–20 system
• F4 (classification), a wheelchair sport classification that corresponds to the neurological level T1- T7

See also

• 4F (disambiguation)
• Four Fs (disambiguation)