F4
Appearance
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