Look up hat in Wiktionary, the free dictionary.

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

HAt is a chemical symbol for:

• Hydrogen astatine

Hat may also refer to:

• An informal term for the caret or circumflex symbol (^) when placed above another symbol, used in typography and mathematical notation
• hat operator in mathematical notation
• hat matrix
• Hat, Azerbaijan, a village
• The Hat, a Southern California fast-food restaurant
• The Hats, a political faction during the Age of Liberty in Sweden.
• de Bono Hats, the six thinking strategies
• Hat, The Haskell Tracer, a debugging tool for Haskell programming language

HAT is used as an acronym for:

• Hellenic Aeronautical Technologies, a Greek airplane manufacturer
• Help authoring tool, software used to create online help manuals
• Histone acetyltransferase, enzymes that acetylate conserved lysine amino acids on histone proteins
• History Aptitude Test, administered to students applying to read History at Oxford University
• Human African trypanosomiasis, diseases caused by parasitic protozoan trypanosomes
• HAT medium, a selective medium used in microbiology and immunology
• Verklarende Handwoordeboek van die Afrikaanse Taal, an Afrikaans dictionary
• Hungarian Automated Telescope Network (HATNet), a telescope network for detecting and characterizing extrasolar planets

[edit] See also

• Hats (disambiguation)
• Hatt (disambiguation)

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