This article is about the letter of the Greek alphabet. For other uses, see Tau (disambiguation). For the Latin letter, see T . Look up Τ or τ in Wiktionary, the free dictionary. Greek alphabet Αα Alpha Νν Nu Ββ Beta Ξξ Xi Γγ Gamma Οο Omicron Δδ Delta Ππ Pi Εε Epsilon Ρρ Rho Ζζ Zeta Σσς Sigma Ηη Eta Ττ Tau Θθ Theta Υυ Upsilon Ιι Iota Φφ Phi Κκ Kappa Χχ Chi Λλ Lambda Ψψ Psi Μμ Mu Ωω Omega Other characters Digamma Qoppa San Sampi Stigma Sho Heta Tsan Greek diacritics

Tau (uppercase Τ, lowercase τ; Greek: Ταυ /ˈtaf/) is the 19th letter of the Greek alphabet. In the system of Greek numerals it has a value of 300. The name in English is pronounced /ˈtaʊ/, but in Modern Greek it is /ˈtaf/. This is because the pronunciation of the combination of Greek letters αυ has changed from ancient to modern times from one of [au] to either [av] or [af], depending on what follows (see Greek orthography).

Letters that arose from tau include Roman T and Cyrillic Te (Т, τ).

The symbolism of the cross was connected not only to the letter chi, but also to tau, the equivalent of the last letter in the Phoenician and Old Hebrew alphabets, and which was originally cruciform in shape.

Contents 1 Scientific uses 2 Other uses 3 Miscellaneous 4 References // Scientific uses

The lower-case letter τ is used as a symbol for:

The circle constant of one turn, the ratio of a circle circumference to its radius, 6.283...,1 equal to 2π The perceived motion-gap in General Tau Theory, a psychological principle of perception. Torque, the rotational force in mechanics. In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature. Tuning and Analysis Utilities (TAU) performance evaluation tool, computer science 2 Used as the symbol for tangent by Richard Feynman in order to avoid any confusion caused by "tan" The elementary tau lepton particle in particle physics. The lifetime of a spontaneous emission process. The specific tax amount. The time constant of any device, such as an RC circuit. The dose interval in pharmacokinetics. Proper time in relativity. The symbol of continuity in electro-flux resonance. The symbol for tortuosity in hydrogeology. A coefficient of correlation — see Kendall's tau. The golden ratio 1.618... (although φ (phi) is more common) Ramanujan's tau function in number theory. Tau in astronomy is a measure of opacity, or how much sunlight cannot penetrate the atmosphere. Tau in biochemistry is a protein associated with microtubules and is implicated in neurodegenerative diseases such as Alzheimer's Disease and FTLD. Shear stress in continuum mechanics. Divisor function in number theory. Sequence A002183 in the OEIS: Number of divisors of highly composite numbers The prefix of many stars, via the Bayer stellar designation system. (Tau Ceti is such a star.) The expressed period of the freerunning rhythm of an animal (circadian rhythm terminology), i.e., the length of the daily cycle of an animal when kept in constant light or constant darkness Kendall's tau rank correlation coefficient as a non-parametric correlation measure in statistics. Other uses In ancient times, a symbol for life and/or resurrection, whereas the 8th letter of the Greek alphabet, theta, was considered the symbol of death. In Biblical times, the Taw was put on men to distinguish those who lamented sin, although newer versions of the Bible have replaced the ancient term “Taw” with "mark" (Ezekiel 9:4) or "signature" (Job 31:35). Its original sound value is a voiceless alveolar plosive, IPA /t/, Tau is usually considered as the symbol of Franciscan orders due to St. Francis' love for it, symbol of the redemption and of the Cross. Almost all Franciscan churches have painted a tau with two crossing arms, both with stigmata, the one of Jesus and the other of Francis; usually members of the Secular Franciscan Order wear a wooden τ in a string with three knots around the neck. Tau mission, a proposal to send a space probe to a thousand astronomical units from the Earth and Sun. The Tau Empire, one of the playable races in Warhammer 40K universe. In Freelancer, the Tau systems make up much of the Border Worlds. Hyundai Motors uses "Tau" to identify their recently introduced V8 engine. In Mobile Suit Gundam 00, imitation-solar furnaces used to power the three Throne Gundams and later the United Nations' GN-X and Alvatore are referred to as GN Drives Tau, as opposed to the original drives used by Celestial Being. In the game Half Life 2, the buggy uses a mounted Tau Cannon which fires bolts of electricity in rapid succession. It can also charge up a powered current. Miscellaneous

An essay written around 160 AD, attributed to Lucian, a mock legal prosecution called The Consonants at Law — Sigma v. Tau in the Court of Seven Vowels contains a reference to the attribution. Sigma petitions the court to sentence Tau to death by crucifixion, saying:

Men weep, and bewail their lot, and curse Cadmus with many curses for introducing Tau into the family of letters; they say it was his body that tyrants took for a model, his shape that they imitated, when they set up structures on which men are crucified. Stauros (cross) the vile engine is called, and it derives its vile name from him. Now, with all these crimes upon him, does he not deserve death, nay, many deaths? For my part I know none bad enough but that supplied by his own shape — that shape which he gave to the gibbet named stauros after him by men. References ^ The Tau manifesto ^ Tuning and Analysis Utilities
tau: Definition from Answers.com
tau n. The 19th letter of the Greek alphabet. An elementary particle of the lepton family, having a mass about 3,550 times that of the electron, a
www.answers.com/topic/tau
Tau: We can topple United
Captain Jimmy Tau is confident Kaizer Chiefs can dethrone Premier Soccer League champions SuperSport United.


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Tau | Define Tau at Dictionary.com
Tau definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now!
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Tau Chapter Delta Theta Tau sorority makes graduate grants available
VALPARAISO | Carol Ronneau, president of the local Delta ThetaTau Chapter, Delta Theta Tau Sorority Inc. will give $15,000 forEducational Grants for specialized training in guidance andcounseling.


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Tau - Lexicanum
The Tau are a young race of technologically-oriented beings from the Eastern Fringe. ... It was not until the Damocles Crusade that the Imperium again contacted the Tau. ...
wh40k.lexicanum.com/wiki/Tau
Researches discover reducing tau protein level can prevent Αβ protein transport in Alzheimer’s disease
Amyloid beta (Αβ) proteins, widely thought to cause Alzheimer's disease (AD), block the transport of vital cargoes inside brain cells. Scientists at the Gladstone Institute of Neurological Disease (GIND) have discovered that reducing the level of another protein, tau, can prevent Aβ from causing such traffic jams.


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warhammer40k.wikia.com/wiki/Tau
TAU
As at 09-Sep-2010 10:53:46 - All data delayed by at least 15 minutes. *The market capitalisation of companies reflects the London listed element only. These figures are approximate and are subject to change.


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For information on how to make an offer to purchase TAU.COM, please click HERE. The following are some of the websites designed and engineered by TAU.COM Websites. ...
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TAU Investigates Brain Connections To Understand Disorders Of The Mind
Uncovering the secrets of the brain requires an intense network of collaborative research. Building on a tool that was co-developed in his laboratory and described in a recent issue of Brain, Dr. Yaniv Assaf of Tel Aviv University's Department of Neurobiology is collaborating with an international team of scientists to understand how different parts of the human brain "connect" - and to turn ...


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tau - Wiktionary
tau (plural taus) The name of the letter T in the Greek, Hebrew and ... 1658: Nor shall we take in the mysticall Tau, or the Crosse of our blessed Saviour, which ...
en.wiktionary.org/wiki/tau
Sigma Tau Gamma suspended from rush
With fall rush underway, students will notice that this semester there is one less fraternity on campus. Due to a suspension set in place by the University, hopeful fraternity members will not be able to rush Sigma Tau Gamma this fall.


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Alpha Tau Omega Fraternity
A resource designed to further the ATO Mission through timely exchange of information, knowledge and ideas. ... The Eta Tau chapter at Austin Peay State University ...
www.ato.org
TKE recruitment boosts numbers, diversity
Tau Kappa Epsilon is proud of many things this semester, not the least of which is nearly tripling its membership size.


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How to prevent Alzheimer's-associated traffic jams in the brain
Washington, Sep 10 : Reducing the level a protein, tau, can prevent the traffic jams due to Alzheimer's disease (AD) causing amyloid beta (Aß) proteins, according to scientists at the Gladstone Institute of Neurological Disease (GIND).


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Software tutorial helps engineers
Theta Tau, UT’s professional engineering fraternity, offered a free Autodesk Inventor tutorial to engineering students Wednesday.


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DONCASTER HOSTS CUP REMATCH
Askar Tau and Darley Sun, first and second in the Doncaster Cup 12 months ago, are among 10 horses declared for Group Two heat on Town Moor on Friday.


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