Hat (disambiguation)

A hat is an item of clothing worn on the head.

Hat or HAT may also refer to:

Film

 * The Hat (film), a 1999 short film by Michèle Cournoyer
 * The Hat, a 1912 film by Rollin S. Sturgeon
 * The Hat, a 1963 film by Faith Hubley and John Hubley

Mathematics

 * Hat matrix, a mathematical operation in statistics
 * Hat operator, notation used in mathematics
 * Hat function, alternate name for the triangular function
 * A solution to the einstein problem, a shape nicknamed the "hat"

Organisations

 * Handball Association of Thailand, governing body of handball in Thailand
 * Hutchison Asia Telecom Group, a business division in telecommunications
 * Hellenic Aeronautical Technologies, a Greek aeroplane manufacturer
 * Helicopter Air Transport, a defunct American helicopter operator

People

 * Jack McVitie (1932–1967), known as Jack "The Hat", English gangster
 * Les Miles (born 1953), known as The Hat, American football coach
 * Jan Åge Solstad (born 1969), known as Hat, former vocalist for the Norwegian black metal band Gorgoroth

Places

 * Hať, Moravian-Silesian Region, Czech Republic
 * Hat, Azerbaijan
 * Hat, Nepal
 * Hat, Berehove Raion, Ukraine
 * Hat District, Al Mahrah Governorate, Yemen
 * Hat Island (disambiguation)

Science

 * Human African trypanosomiasis (sleeping sickness)
 * HAt, symbol for hydrogen astatide
 * Histone acetyltransferase, an enzyme class
 * HAT medium, used in microbiology and immunology, for example in culturing hybridoma cells
 * Hungarian-made Automated Telescope, used in the HATNet Project

Technology

 * Hardware Attached on Top, expansion board format for the Raspberry Pi computer.
 * Hashed array tree, in computer programming.
 * Help authoring tool, software for "help" documents.

Other uses

 * Handwoordeboek van die Afrikaanse Taal, an Afrikaans dictionary
 * Haitian Creole language, with ISO 639-2 and 639-3 code
 * Hat, slang for the caret (computing) (^)
 * Hat, slang for the circumflex (ˆ)
 * Hat (Davy Graham album), released in 1969
 * Hat. (Mike Keneally album), released in 1992
 * History Aptitude Test, an admissions test at Oxford University
 * The Hat, a Southern California fast-food restaurant
 * The Hat (book), a children's book by Tomi Ungerer
 * "The Hat", an episode of Homicide: Life on the Street (season 4)
 * Hi-hat (instrument), a standard part of a drum kit
 * Short for hatnote - WP:HAT (disambiguation)