Look up tau, Tau, Τ, or τ in Wiktionary, the free dictionary.

Tau (Τ or τ) is the 19th letter of the Greek alphabet.

Tau may also refer to:

• Tau (mathematical constant), a circle constant equal to 2π (6.28318...)
• Tau test in statistics (tau-a, tau-b and tau-c tests or Kendall tau rank correlation coefficient)
• Tau function (disambiguation), several

• Tau, Norway, a small town in Strand municipality, Rogaland county, Norway
• Tău (disambiguation), two villages in Romania
• Ta‘ū, an island in the Manuʻa Island Group of American Samoa
• Ta'u County, a county in American Samoa
• Tau (Tongatapu), an island of the Tongatapu group in Tonga
• Tau (Haʻapai), an island of the Haʻapai group in Tonga
• Tau (Botswana), a village at the base of the Tswapong Hills in Botswana

• TAU (spacecraft), a proposal to send a space probe to a thousand astronomical units from the Earth
• Tau (particle), also called Tau lepton, an elementary particle in particle physics
• Tau emerald, a species of dragonfly
• Tau neutrino a subatomic elementary particle
• Tau protein, a biochemical protein associated with microtubules
• Tau, the standard astronomical abbreviation for Taurus (constellation)
• Tau, a mutation in the Casein kinase 1 epsilon protein, in circadian biology
• Rational Tau, a UML and SysML modeling tool
• Opsanus tau, the scientific name for the oyster toadfish

• Tau (film), a 2018 thriller film starring Maika Monroe
• Tău (Negură Bunget album), a 2015 album by Romanian black metal band Negură Bunget
• T'au, an alien race from Warhammer 40,000
• Pan Tau, hero of Czech films and television series
• Tau Zero, a novel by Poul Anderson
• Tau Volantis, a planet shown in Dead Space 3
• Tau Cannon, an energy weapon from the video game Half-Life
• Tau Films, an American visual effects and animation company
• Tau, a stellar system mentioned in the video game Warframe

• Tama Art University
• Tel Aviv University
• Texila American University
• Anna University of Technology, Tiruchirappalli

• Abel Tau, South African politician
• Jimmy Tau, South African football (soccer) player
• Max Tau, German-Norwegian writer, editor, and publisher
• Nicolae Țâu, Moldovan politician who was Foreign Minister of Moldova between 1990 and 1993
• Parks Tau, South African politician who was mayor of Johannesburg from 2011-2016
• Percy Tau (born 1994), South African international footballer
• Tebogo Tau, Botswana judge
• Tau (rapper), Polish rapper
• Devi Lal (politician), popularly known as Tau, Indian politician who was Deputy Prime Minister from 1989 to 1991

• Tau (mythology), an evil spirit in Guaraní mythology
• Tau effect, a sensory illusion relating to the perception of space
• Cross of Tau, a Christian symbol so called due to its resemblance to the letter Tau
• Tourist Association of Ukraine
• The Greek letter representing Expiration (options)

• Tau function (disambiguation)

This disambiguation page lists articles associated with the title Tau.
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