Tau Tau (; uppercase Τ, lowercase τ or \boldsymbol\tau; ) is the nineteenth letter of the Greek alphabet, representing the voiceless alveolar plosive, voiceless dental or alveolar plosive . In the system of Greek numerals, it has a value of 300 ...

(Τ or τ) is the 19th letter of the Greek alphabet. Tau may also refer to:

Mathematics

Tau (mathematical constant) The number (; spelled out as tau) is a mathematical constant that is the ratio of a circle's circumference to its radius. It is approximately equal to 6.28 and exactly equal to 2Pi, . and are both circle constants relating the circumference ...

, 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) Tau function may refer to: * Tau function (integrable systems), in integrable systems * Ramanujan tau function, giving the Fourier coefficients of the Ramanujan modular form * Divisor function In mathematics, and specifically in number theo ...

, several

Geography

Tau, Norway Tau is a village in Strand municipality in Rogaland county, Norway. The village is located on the shore of the Horgefjorden, a branch of the main Boknafjorden. Strand Church is located in the village. The village has a population (2019) of 3, ...

, 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) Tau (; uppercase Τ, lowercase τ or \boldsymbol\tau; ) is the nineteenth letter of the Greek alphabet, representing the voiceless dental or alveolar plosive . In the system of Greek numerals, it has a value of 300. The name in English is p ...

, 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 The Tswapong Hills are a mountain range in the Central District, Botswana. They rise to an elevation of 300 to 400 m above the hardveld of the almost 900 m high surrounding plateau. Geologically, these flat-topped hills are similar to the Waterb ...

in Botswana

Science and technology

* TAU (spacecraft), a proposal to send a space probe to a thousand astronomical units from the Earth *

Tau (particle) The tau (), also called the tau lepton, tau particle or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin-1/2, spin of . Like the electron, the muon, and the three neutrinos, the tau is a lepton, ...

, also called Tau lepton, an elementary particle in particle physics * Tau emerald, a species of dragonfly *

Tau neutrino The tau neutrino or tauon neutrino is an elementary particle which has the symbol and zero electric charge. Together with the tau (particle), tau (), it forms the third generation (physics), generation of leptons, hence the name tau neutrino. It ...

a subatomic elementary particle *

Tau protein The tau proteins (abbreviated from tubulin associated unit) form a group of six highly soluble protein isoforms produced by alternative splicing from the gene ''MAPT'' (microtubule-associated protein tau). They have roles primarily in maintainin ...

, a biochemical protein associated with microtubules * Tau, the standard astronomical abbreviation for

Taurus (constellation) Taurus (Latin, 'Bull') is one of the constellations of the zodiac and is located in the northern celestial hemisphere. Taurus is a large and prominent constellation in the Northern Hemisphere's winter sky. It is one of the oldest constellations, ...

* Tau, a mutation in the

Casein kinase 1 The Casein kinase 1 family () of protein kinases are serine/threonine-selective enzymes that function as regulators of signal transduction pathways in most eukaryotic cell types. CK1 isoforms are involved in Wnt signaling pathway, Wnt signaling, ci ...

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 Pan Tau (Czech language, Czech for "Mr. Tau") is a character created for a children's television series. There were 33 episodes in 3 series made by the Czechoslovak Television (ČST) in cooperation with Barrandov Studios and the West Germany, We ...

, hero of Czech films and television series * '' Tau Zero'', a novel by Poul Anderson * Tau Volantis, a planet shown in ''

Dead Space 3 ''Dead Space 3'' is a 2013 survival horror Action game, action video game developed by Visceral Games and published by Electronic Arts for PlayStation 3, Windows, and Xbox 360. It is the third and final main entry in the ''Dead Space'' series. T ...

'' * Tau Cannon, an energy weapon from the video game ''

Half-Life Half-life is a mathematical and scientific description of exponential or gradual decay. Half-life, half life or halflife may also refer to: Film * Half-Life (film), ''Half-Life'' (film), a 2008 independent film by Jennifer Phang * ''Half Life: ...

'' * Tau Films, an American visual effects and animation company *Tau, a stellar system mentioned in the video game ''

Warframe ''Warframe'' is a free-to-play action role-playing third-person shooter multiplayer online game developed and published by Digital Extremes. First released for Windows personal computers in March 2013, it was later ported to PlayStation 4 ...

'' * Tau (sculpture), a sculpture by Tony Smith

Education

Tama Art University or is a private Art school, art university located in Tokyo, Japan. It is known as one of the top art schools in Japan. History The forerunner of Tamabi was Tama Imperial Art School (多摩帝国美術学校, Tama Teikoku Bijutsu Gakkō) fou ...

Tel Aviv University Tel Aviv University (TAU) is a Public university, public research university in Tel Aviv, Israel. With over 30,000 students, it is the largest university in the country. Located in northwest Tel Aviv, the university is the center of teaching and ...

* Texila American University * Anna University of Technology, Tiruchirappalli

People

* Abel Tau, South African politician *

Jimmy Tau Jimmy Tau (born 23 July 1980 in Kimberley, Northern Cape, Kimberley, Northern Cape) is a South African former association football, soccer player who played as a Full-back (association football), right-back. He played for Kaizer Chiefs and Orla ...

, 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 The tau effect is a spatial perceptual illusion that arises when observers judge the distance between consecutive stimuli in a stimulus sequence. When the distance from one stimulus to the next is constant, and the time elapsed from one stimulus to ...

, 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) In finance, the expiration date of an option contract (represented by Greek letter tau, τ) is the last date on which the holder of the option may exercise it according to its terms. In the case of options with "automatic exercise", the net va ...