Tau (Τ or τ) is the 19th letter of the Greek alphabet.
Tau may also refer to:
Mathematics Tau (mathematics), a circle constant equal to (6.28318...) Tau test in statistics (tau-a, tau-b and tau-c tests or Kendall tau rank correlation coefficient) Tau function (disambiguation), several
Geography Tau, Norway, a small town in Strand municipality, Rogaland county, Norway Tău (disambiguation), two villages in Romania Ta‘ū, an island in the Manua Island Group of American Samoa Ta'u County, a county in American Samoa Tau (Tongatapu), an island of the Tongatapu group in Tonga Tau (Haapai), an island of the Haapai group in Tonga Tau (Botswana), a village at the base of the Tswapong Hills in Botswana
Science and technology 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
Arts and media 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 Tau (sculpture), a sculpture by Tony Smith
Education Tama Art University Tel Aviv University Texila American University Anna University of Technology, Tiruchirappalli
People 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
Other 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)
See also Tau function (disambiguation) Tao Chinese philosophy