# F (disambiguation)

F is the sixth letter of the Latin alphabet.
F may also refer to:

## Science and technology
### Mathematics

* F or f, the number 15 in hexadecimal and higher positional systems
* $_p$F$_q$, the hypergeometric function
* F-distribution, a continuous probability distribution
** F-test, a statistical test
* f, SI prefix femto, factor 10$^{−15}$
* F, Fibonacci number

### Computing and engineering

* F (programming language), a subset of Fortran 95
* F Sharp (programming language), a functional and object-oriented language for the .NET platform.
* F* (programming language), a dependently typed functional language for the .NET platform.
* F-measure, the harmonic mean of precision and recall
* f, in programming languages often used to represent the floating point
* F connector, used for inlet in cable modems
* F crimp, a type of solderless electrical connection
* F band (NATO), a radio frequency band from 3 to 4 GHz
* F band (waveguide), a millimetre wave band from 90 to 140 GHz

### Physics

* °F, degree on the Fahrenheit temperature scale
* F, for farad, a unit for electric capacitance
* F or ℱ, the Faraday constant
* f, focal length of a lens
** f-number (sometimes called f-ratio, f-stop, or written f/), the focal length divided by the aperture diameter
* ${\vec {F}}$, F, F, force
* f, frequency
* F (or A), Helmholtz Free Energy
* F, the electromagnetic field tensor in electromagnetism
    Often generalized to include the field tensors of other interactions, as in i.e. the gluon field strength tensor.
* F region, part of the ionosphere

### Chemistry

* Fluorine, symbol F, a chemical element
* f-block, a block of elements in the periodic table of elements
* F (or Phe), abbreviation for compound phenylalanine

### Biology

* Form (botany)
* Form (zoology)
* Bioavailability, which is expressed as the letter "F" in medical chemistry equations
* Haplogroup F (Y-DNA), a patrilineal haplogroup
* Haplogroup F (mtDNA), a matrilineal haplogroup

## Music

* F (musical note)
* F major, a scale
* F minor, a scale
* F major chord, Chord names and symbols (popular music)
* f, Forte (music)
* F (album), an album by Japanese singer Masaharu Fukuyama
* F Album, an album by Japanese duo KinKi Kids
* "F", song on the double A-side single "Tsume Tsume Tsume/F" by Japanese metal band Maximum the Hormone

## Transport

* F Sixth Avenue Local, a rapid transit service of the New York City Subway
* F (S-train), trains on the ring line of Copenhagen's commuter train network
* F Market & Wharves, a heritage streetcar line operated by the San Francisco Municipal Railway
* Tokyo Metro Fukutoshin Line, a subway service operated by the Tokyo Metro, labeled
* The NYSE ticker symbol of the Ford Motor Company
* , the official West Japan Railway Company service symbol for the Osaka Higashi Line.
* Ford F-Series, a series of full-size pickup trucks from Ford Motor Company

## Military

* F, a class of designation in the United States military aircraft designation systems which stands for "Fighter"
* F, a common designation for fighter aircraft
* Foxtrot, the military time zone code for UTC+06:00
* F band (NATO), a radio frequency band from 3 to 4 GHz

## Other uses

* F (film), a 2010 film directed by Johannes Roberts
* France, on the vehicle registration plates of the European Union
* F (grade), a failing grade
* f, the symbol used in the International Phonetic Alphabet for the voiceless labiodental fricative
* f, common abbreviation in lexicons meaning feminine grammatical gender
* Fax, referring to a facsimile machine
* F, abbreviation for fax number
* The citation abbreviation of the Federal Reporter
* F, Fujitsu's mobile phones in Japan
* Forward position in Australian Rules football
* "F" or "F***", sometimes used to censor "fuck".
* f, abbreviation for the social networking service Facebook
* Common abbreviation for floor (for example, "3F" = 3rd floor)
* F word (disambiguation), euphemism for several words beginning with "f"
* Dominical letter F for a common year starting on Tuesday
* F, as an online expression of respects to a recently deceased person (as a reference to the videogame Call of Duty: Advanced Warfare)
* F, the production code for the 1964 Doctor Who serial The Aztecs
* "F" Is for Fugitive, the sixth novel in Sue Grafton's "Alphabet mystery" series, published in 1989