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

Science and technology

Mathematics

* F or f, the number 15 (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 * , 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 information retrieval#F-measure, 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 * or ℱ, the Faraday constant * , 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

, , , force * , 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), ''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 (New York City Subway service), 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 * The NYSE ticker symbol of the Ford Motor Company * 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 * List of military time zones#F, 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), ''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 * Australian rules football positions#Full forward, 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 Storey, 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 * Press F to pay respects, 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 (Doctor Who), The Aztecs'' * ''"F" Is for Fugitive'', the sixth novel in Sue Grafton's "Alphabet mystery" series, published in 1989