# K (disambiguation)

K is the eleventh letter of the Latin alphabet.

K may also refer to:

## In fiction and literature

• K′, also known as "K Dash" or "K Prime", a King of Fighters character
• K, the title of a 1915 novel by Mary Roberts Rinehart
• 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 TV series Robotto Keiji (Robot Detective)
• K, Todd and Riley's adoptive superspy mother on the Disney program The Replacements
• Agent K, the character played by Tommy Lee Jones in Men in Black, Men in Black II, and Men in Black 3
• K, the protagonist played by John Abraham in No Smoking
• K, a constructed language invented by Robert Dessaix
• K, a character in Natsume Soseki's novel Kokoro
• K (anime), a Japanese anime
• Joseph K., the protagonist of Kafka's 1925 novel, The Trial

## In mathematics

• $K_n$ and $K_{m,n}$, the complete and complete bipartite graph
• K-theory, a branch of topology and algebra
• Blackboard bold $\mathbb K$ is a commonly used symbol for a field, as an abbreviation of the German Körper.

## As a symbol or abbreviation

### Unit

• k, symbol of the kilo- prefix in the SI and other systems of unit that denotes multiples of 1000
• K, SI symbol for kelvin, the SI unit of thermodynamic temperature
• K (upper case), informal abbreviation for kibibyte or 1024 bytes
• k (lower case), informal abbreviation for kilobyte or 1000 bytes
• K, kilobit (more correctly kbit)
• K, informal abbreviation for kilometre (SI symbol: km)