# K (disambiguation)

K, or k, is the eleventh letter of the English alphabet.
K may also refer to:

## General uses

* K, a normal modal logic
* K (programming language), an array processing language developed by Arthur Whitney and commercialized by Kx Systems
* K (cider), a British draft cider manufactured and distributed by the Gaymer Cider Company of Bath, England
* K band (disambiguation)
* K computer, a Japanese supercomputer
* K-factor (disambiguation), several unrelated terms in physics, engineering, telecommunications and chess
* Vitamin K, a group of vitamins that are needed to promote blood coagulation
* Kappa (Κ) (Greek alphabet)
* Ka (Cyrillic) (К) (Cyrillic alphabet)
* Chrysler K platform, 1981–1995 car design used by Chrysler
* Low-K, the dielectric constant in semiconductors, electronics, and physics
* K–12 education, a designation for the sum of primary and secondary education, used mainly in North America
* K, a prefix for North American call signs used by most broadcast stations in the US west of the Mississippi River
* K College, in Tonbridge, Kent
* Kellanova, an American food processing company (NYSE stock ticker K)

## People

* Adem K, Australian musician
* Yasmin K., German singer
* K (composer), Indian film composer
* K (singer) (born 1983), Korean singer who works in Japan as a J-pop singer
* K, deceased guitarist of Japanese visual kei band Moi dix Mois
* Kiccha Sudeepa, Indian actor, commonly abbreviated as simply K
* K, Japanese singer and dancer, member of &Team

## In fiction and literature
### Books

* K (Minogue and Baker book), a photographic book by Kylie Minogue and William Baker
* K, a 2011 novel by Bernardo Kucinski, Brazilian journalist and political scientist
* K. (novel), a 1915 novel by Mary Roberts Rinehart
* "K" Is for Killer, the eleventh novel in Sue Grafton's "Alphabet mystery" series, published in 1994

### Films and TV

* K (2002 film), directed by Shoja Azari, an Iranian American
* K, a 1997 French film directed by Alexandre Arcady
* K (TV series), a Japanese anime
* K, the production code for the 1964 Doctor Who serial The Dalek Invasion of Earth

### Characters

* K, the protagonist of Franz Kafka's 1926 novel The Castle
* K, a character in the manga and anime Gravitation
* K, the main character in the novel by the same name by Bernardo Kucinski
* K, the main character in the TV series Robotto Keiji (Robot Detective)
* K, Todd and Riley's adoptive superspy mother on the Disney program The Replacements
* K, the protagonist played by John Abraham in No Smoking
* K, a character in Natsume Soseki's novel Kokoro
* K, a character in the visual novel Zero Escape: Virtue's Last Reward
* K′, also known as "K Dash" or "K Prime", a King of Fighters character
* Agent K, the character played by Tommy Lee Jones in Men in Black, Men in Black II, and Men in Black 3
* Joseph K., the protagonist of Kafka's 1925 novel, The Trial
* K, the main character in the 2017 film Blade Runner 2049
* Dr. K, the character in Power Rangers RPM

### Other

* K, a constructed language invented by Robert Dessaix

## In mathematics

* $K_{n}$ and $K_{m,n}$, the complete and complete bipartite graph
* K-theory, a branch of topology and algebra
* $\mathbb {K}$, in blackboard bold, is a commonly used symbol for a field, as an abbreviation of the German Körper.
* K, the complete elliptic integral of the first kind

## In music

* K., abbreviation for Ralph Kirkpatrick’s chronological catalogue of Domenico Scarlatti's keyboard sonatas
* K., abbreviation for the Köchel catalogue, chronological catalogue of compositions by Wolfgang Amadeus Mozart
* K Records, independent record company based in Olympia, Washington

### Albums

* K (album), 1996 album by Kula Shaker

### Songs

* "K", a song by Cul de Sac (band)
* K, a song by the Japanese rock band Bump of Chicken
* "K" (The Tutts song), 2006 song by The Tutts
* "K", a song by The Hold Steady
* "K.", a song from Cigarettes After Sex (album) by Cigarettes After Sex

## In politics

* K, the Keskustapuolue, the Centre Party (Finland)
* K, Kommunistiska Partiet, the Communist Party (Sweden)
* K, the politics and followers of former President of Argentina Néstor Kirchner (1950-2010)

## As a symbol or abbreviation

* k, from Latin kilo, for 1000 (number)
* K, ketamine, a street abbreviation for a recreational drug
* K, Kyocera's mobile phones in Japan
* K, a strikeout in baseball scorekeeping
* K, a contract in legal shorthand
* k, a voiceless velar plosive in the International Phonetic Alphabet
* K, key color (i.e., black) in the CMYK color model, especially for printing
* k, abbreviation of okay, commonly used in instant messaging, or in S.M.S. messages
* K, the construction point of a ski jumping hill
* k, a shorthand for a knighthood in the British honours system
* K, the ticker symbol on the New York Stock Exchange for the Kellogg Company
* K, abbreviation of gridiron football position Kicker (also known as placekicker)

### Unit

* k, symbol of the kilo- prefix in the SI and other systems of unit that denotes multiples of 1000
* K, kelvin, the SI unit of thermodynamic temperature
* K (upper case), informal abbreviation for kibibyte or 1024 bytes (symbol: kiB or kB or KB)
* k (lower case), informal abbreviation for kilobyte or 1000 bytes (symbol: kB)
* k, informal abbreviation for kibibit (symbol: kb or kib or Kb or kbit or kibit or Kbit) 1024 bits
* k, informal abbreviation for kilobit (symbol: kb or kbit) 1000 bits
* k or K, abbreviation for kilometre (SI symbol: km) (especially in measured-distance sports, e.g. "10K run")
* k or K, abbreviation for kilohm (symbol; kΩ), a measure of resistance in electronics

### In the natural sciences

* K, one-letter designation for the amino acid lysine
* K, for carrying capacity of an environment
* K carat (purity), measurement applied to gold
* K, the Cretaceous geological period
* K, herbarium code for Kew Herbarium

#### In the physical sciences

* Potassium, symbol K, a chemical element
* k, angular wavenumber of a wave
* k, wavevector of a wave
* K, the symbol that represents a kaon in particle physics
* k, the spring constant in Hooke's law relating deformation (strain) and force applied (stress) to a material body
* k or k$_B$, the Boltzmann constant, the physical constant relating energy and temperature at the particle level
* $\kappa$ or K, relative static permittivity (dielectric constant)
* k$_e$, the Coulomb constant
* K, equilibrium constant
* k, thermal conductivity
* k, the Gaussian gravitational constant
* k, often used for some proportionality constant

## Military and guns

* Kilo, the military time zone code for UTC+10:00
* Operation K, a Japanese World War II naval operation
* The K Project, a series of five nuclear tests by the Soviet Union
* Swedish K, a submachine gun
* AK-47, an assault rifle

## Transportation

* K (Los Angeles Railway), defunct streetcar line in Los Angeles, California
* K (Broadway Brooklyn Local), earlier KK, discontinued in 1976
* K (Eighth Avenue Local), a defunct train service on the New York City Subway, which was known as the AA until 1985
* K Ingleside (San Francisco Muni)
* K Line (Los Angeles Metro)
* Sakaisuji Line, a subway service operated by the Osaka Metro, labeled
* , the official West Japan Railway Company service symbol for the Kishin Line.