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 The Lockheed P-38 Lightning is an American single-seat, twin piston-engined fighter aircraft that was used during World War II. Developed for the United States Army Air Corps (USAAC) by the Lockheed Corporation, the P-38 incorporated a distinc ...

World War 2 fighter * Fleetwings Sea Bird, a variant of which was the F-4 * 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 The Boeing P-12 or Boeing F4B is an American pursuit aircraft that was operated by the United States Army Air Corps, United States Marine Corps, and United States Navy. It was the chief fighter aircraft in American service during the early 193 ...

biplane fighter **

Grumman F4F Wildcat The Grumman F4F Wildcat is an American carrier-based A carrier-based aircraft (also known as carrier-capable aircraft, carrier-borne aircraft, carrier aircraft or aeronaval aircraft) is a naval aircraft designed for operations from aircra ...

, a carrier-based fighter aircraft in World War 2 **

Vought F4U Corsair The Vought F4U Corsair is an American fighter aircraft that saw service primarily in World War II and the Korean War. Designed and initially manufactured by Vought, Chance Vought, the Corsair was soon in great demand; additional production con ...

, a World War 2 fighter ** Douglas F4D Skyray, a carrier-based fighter/interceptor, first flight 1951 **

McDonnell Douglas F-4 Phantom II The McDonnell Douglas F-4 Phantom II is an American tandem two-seat, twin-engine, all-weather, long-range supersonic jet interceptor and fighter-bomber that was developed by McDonnell Aircraft for the United States Navy.Swanborough and Bower ...

, a supersonic fighter-bomber, first flight 1958

Art, entertainment, and music

* F4, or Flower 4, the four handsome boys appearing in Japanese manga ''

Boys Over Flowers is a Japanese manga series written and illustrated by Yoko Kamio. The story takes place in the fictional Eitoku Academy, an elite school for children from rich families. It tells the story of Tsukushi Makino, a girl from a middle-class ...

'' * F4 (band), Taiwanese boy band * ''

F4 Thailand ''F4 Thailand: Boys Over Flowers'' (; ) is a Thai romantic series starring Tontawan Tantivejakul, Vachirawit Chivaaree, Jirawat Sutivanichsak, Metawin Opas-iamkajorn and Hirunkit Changkham. Based on the Japanese manga series '' Hana Yori Dan ...

'', a Thai television series * F₄, Middle

F (musical note) F is a musical note, the fourth above C or fifth below C. It is the fourth note and the sixth semitone of the solfège. It is also known as fa in fixed-do solfège. It is enharmonic equivalent with E (E-sharp) and G (G-double flat), amongs ...

Fantastic Four The Fantastic Four, often abbreviated as FF, is a superhero team appearing in American comic books published by Marvel Comics. The team debuted in '' The Fantastic Four'' #1 ( cover-dated November 1961), helping usher in a new level of realism i ...

, fictional superhero team

Computing and technology

* Faugère's F4 algorithm in computer algebra * F4, a

function key A function key is a key on a computer or computer terminal, terminal computer keyboard, keyboard that can be programmed to cause the operating system or an application program to perform certain actions, a form of soft key. On some keyboards/com ...

on a computer keyboard * f4transkript, a transcription software * Samsung Galaxy F04, an Android-based

smartphone A smartphone is a mobile phone with advanced computing capabilities. It typically has a touchscreen interface, allowing users to access a wide range of applications and services, such as web browsing, email, and social media, as well as multi ...

manufactured by

Samsung Electronics Samsung Electronics Co., Ltd. (SEC; stylized as SΛMSUNG; ) is a South Korean multinational major appliance and consumer electronics corporation founded on 13 January 1969 and headquartered in Yeongtong District, Suwon, South Korea. It is curr ...

Mathematics

* F₄ (mathematics), the name of a Lie group and also its Lie algebra f₄ * * ''F₄'',

Fermat number In mathematics, a Fermat number, named after Pierre de Fermat (1601–1665), the first known to have studied them, is a natural number, positive integer of the form:F_ = 2^ + 1, where ''n'' is a non-negative integer. The first few Fermat numbers ...

Sports and games

F4 (classification) F4, also T4 and SP4, is a wheelchair sport classification that corresponds to the neurological level T1- T7. Historically, it was known as 1C Incomplete, 2 Complete, or Upper 3 Complete. People in this class have normal upper limb function, and ...

, a wheelchair sport classification *

Formula 4 FIA Formula 4 (F4) is an open-wheel racing car category intended for junior drivers. There is no global championship, but rather individual nations or regions can host their own championships in compliance with a universal set of rules and speci ...

, a class of car racing * ''f4'', designates a square in

Algebraic notation (chess) Algebraic notation is the standard method of chess notation, used for recording and describing moves. It is based on a system of coordinates to identify each square on the board uniquely. It is now almost universally used by books, magazines, new ...

* 1. f4, or

Bird's opening Bird's Opening (or the Dutch Attack) is a chess opening characterised by the move: : 1. f4 Named after 19th century English player Henry Bird, Bird's opening is a standard flank opening. White's strategic ideas involve control of the e5-squa ...

, an opening move in chess

Transportation and vehicles

F4 (Istanbul Metro) The F4, officially referred to as the F4 Boğaziçi Üni./Hisarüstü–Aşiyan funicular line () is a long funicular railway in Beşiktaş, Istanbul. When opened on 28 October 2022, it became the fourth funicular line in Istanbul as well as the ...

, a funicular railway in Istanbul Turkey * F4 Cross Harbour, or Cross Harbour ferry services (2017–2020), Sydney, Australia * F4 Pyrmont Bay, or Pyrmont Bay ferry services, Sydney, Australia * Albarka Air (IATA code), a Nigerian airline *

Front-engine, four-wheel-drive layout In automotive design, an F4, or front-engine, four-wheel drive (4WD) layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This car layout, layout is typically chosen for better control on many ...

, in automotive design * MV Agusta F4 series, a series of motorcycles * USS ''F-4'', a U.S. Navy submarine that sank near Honolulu harbor in 1915 * LNER Class F4, a class of British steam locomotives

Other uses

* F4, a

paper size Paper size refers to Technical standard, standardized dimensions for sheets of paper used globally in stationery, printing, and technical drawing. Most countries adhere to the ISO 216 standard, which includes the widely recognized A series ( ...

* F 4 Frösön, a former Swedish Air Force wing * ''f/4'', an

f-number An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the entrance pupil ("clear aperture").Smith, Warren ''Modern Optical ...

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 Form F-4 is an American form used to register securities in connection with business combinations and exchange offers involving foreign private issuers. These activities include mergers and acquisitions, going-private transactions, rights offeri ...

, an American form used to register securities * Nikon F4, a camera * F4, a tornado intensity rating on the

Fujita scale The Fujita scale (F-Scale; ), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation. The official Fujita scale category is determ ...

* F4, an electrode site according to the

10–20 system (EEG) The 10–20 system or International 10–20 system is an internationally recognized method to describe and apply the location of scalp electrodes in the context of an EEG exam, polysomnograph sleep study, or voluntary lab research. This method w ...

* F4 visa, a visa used for Korean adoptees to gain South Korean citizenship