Tau (disambiguation)

Tau is the 19th letter of the Greek alphabet.

Tau may also refer to:

In geography:
* Tau, Norway, a small town in western Norway
* Tău, two villages in Romania
* Tau, Samoa (Taokinaū), an island in the Manuokinaa Island Group of American Samoa
* Tau (Tongatapu), the most northern offshore island of Tongatapu, Tonga
* Tau (Haokinaapai), an island in the southern part of Haokinaapai, Tonga

In science:
* Tau lepton, a fundamental particle.
* Tau (protein), a biochemical protein associated with microtubules
* Tau is the standard astronomical abbreviation for the constellation Taurus
* Tau test in statistics (tau-a, tau-b and tau-c tests or Kendall tau rank correlation coefficient)
* Tau in circadian biology is a mutation in the Casein kinase 1 epsilon protein, which regulates phosphorylation of the clock protein PER
* Tau (theorem prover), an automated theorem prover for first-order predicate logic with equality.

In technology:
* Telelogic TAU, a UML and SysML modeling tool
* TAU mission, a proposal to send a space probe to a thousand astronomical units from the Earth

In fiction:
* Tau'ri, the name for humans of Earth, used in the "Stargate" fictional universe
* Tau (Warhammer 40,000), an alien race from the fictional "Warhammer 40,000" universe
* Tau, a character in the "Battle Arena Toshinden" video game series

In theology:
* Tau (mythology), an evil spirit in Guaraní mythology
* The Cross of Tau, a Christian symbol so called due to its resemblance to the letter Tau

In other uses:
* An acronym for Tel Aviv University
* Jimmy Tau, South African football (soccer) player