# F2

F2, F.II or similar may refer to:

## Science and mathematics

* F$_2$, the chemical formula for fluorine
* $\mathbb {F} _{2}$ or GF(2), in mathematics, the Galois field of two elements
* F2, a category in the Fujita scale of tornado intensity
* F2 hybrid, a type of crossing in classical genetics
* F2 layer, a stratum of the Earth's ionosphere
* F-2 mycotoxin or zearalenone, a chemical produced by fungi
* NIST-F2, an atomic clock

## Motorsports

* Formula Two, a type of open-wheel formula racing category first codified in 1948.
* FIA Formula 2 Championship, a second-tier single-seater championship held from 2009 to 2012.
* FIA Formula 2 Championship, a second-tier single-seater championship held since 2017.

## Medicine

* F2 or Foundation Year 2, part of the UK Foundation Programme for postgraduate medical practitioners
* F-2 (drug), a psychedelic drug
* F2-isoprostane, a compound formed in vivo from fatty acids
* F2 gene, present on human chromosome 11, encodes for thrombin

## Films

* F2: Fun and Frustration, a 2019 Indian Telugu language film starring Venkatesh and Varun Tej

## Technology

* F2, a function key on a computer keyboard
* F2 or flat twin engine, a type of two-cylinder internal combustion engine
* Anik F2, a Canadian geostationary communications satellite
* Nikon F2, a professional SLR camera

## Transportation
### Aviation

* Fly Air, IATA designator F2, a Turkish private airline
* Fieseler F2 Tiger, a German single-seat aerobatic biplane
* Flanders F.2, a 1911 British experimental single-seat monoplane aircraft
* Fokker F.II, a 1919 German early airliner
* Metropolitan-Vickers F.2, a 1941 British early turbojet engine

### Rail

* EMD F2, a class of GM diesel freight locomotive built in 1946
* H&BR Class F2, a class of 0-6-2T steam locomotives of the Hull and Barnsley Railway

### Road

* Alta F2, a 1952 British racing car
* DKW F2, a 1930s German small car
* Marussia F2, a Russian large luxury car

### Boat

* F2, the Sydney Ferries' services to Taronga Zoo

## Military
### Air

* Beechcraft F-2 Expeditor, an American twin engine reconnaissance aircraft
* Blackburn F.2 Lincock, a 1928 British single-seat lightweight fighter
* Bristol F.2 Fighter, a 1916 British two-seat biplane fighter and reconnaissance aircraft
* Dassault Mirage F2, a 1960s French prototype two-seat attack fighter
* Fairey F.2, a 1917 British fighter prototype
* Felixstowe F.2, a 1917 British First World War flying boat
* Hunter F 2, a 1953 Hawker Hunter fighter aircraft variant
* Lübeck-Travemünde F.2, early German reconnaissance floatplane
* McDonnell F-2 Banshee, a carrier-based jet fighter aircraft of the 1950s
* Mitsubishi F-2, a Japanese fighter aircraft, based on the F-16 Fighting Falcon
* RAF Tornado F2, a long-range, twin-engine swing-wing interceptor
* F 2 Hägernäs, a former Swedish Air Force wing

### Sea

* HMS F2, an F class First World War submarine of the Royal Navy
* USS F-2 (SS-21), a 1910s F-class submarine of the United States Navy
* 20 mm modèle F2 gun, a French naval gun

### Land

* F2 81mm Mortar, an Australian weapon
* FR F2 sniper rifle, the standard sniper rifle of the French military
* KMW F2, a German modular wheeled armoured vehicle

## Other uses

* F2 (classification), a wheelchair sport classification
* F-2 visa, a U.S. visa type for dependents of students
* F2Freestylers, British freestyle football duo also known as The F2
* F2 Logistics, Filipino logistics company
** F2 Logistics Cargo Movers, volleyball team owned by the logistics company of the same name
* Formula Two, a type of open-wheel racing
* F2, the second formant