This article is about the letter of the Greek alphabet. For the mathematical constant, see Tau (mathematical constant). For other uses, see Tau (disambiguation).
Not to be confused with Tao or the Latin letter T.
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
History
Archaic local variants
Ϝ
Ͱ
Ϻ
Ϙ
Ͳ
Ͷ
tsan
digamma
Diacritics
Ligatures
Numerals
ϛ (6)
ϟ (90)
ϡ (900)
Use in other languages
Bactrian
Coptic
Albanian
Related topics
Use as scientific symbols
Category
v
t
e
Tau (/ˈtɔː,ˈtɒ,ˈtaʊ/;[1] uppercase Τ, lowercase τ or ; Greek: ταυ[taf]) is the nineteenth letter of the Greek alphabet, representing the voiceless dental or alveolar plosive IPA:[t]. In the system of Greek numerals, it has a value of 300.
The name in English is pronounced /taʊ/ or /tɔː/,[2] but in Greek it is [taf].[3][4] This is because the pronunciation of the combination of Greek letters αυ can have the pronunciation of either [ai], [av] or [af], depending on what follows and if a diaeresis is present on the second vowel (see Greek orthography).
Tau was derived from the Phoenician letter taw (𐤕).[5] Letters that arose from tau include Roman T and Cyrillic Te (Т, т).
The letter occupies the Unicode slots U+03C4 (lowercase) and U+03A4 (uppercase). In HTML, they can be produced with named entities (τ and Τ), decimal references (τ and Τ), or hexadecimal references (τ and Τ).
^"tau". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.) "tau". Dictionary.com Unabridged (Online). n.d.
^"Oxford Dictionaries Online". Oxford University Press. Archived from the original on July 20, 2012.
^Gaifyllia, Nancy (10 Oct 2016). "The Greek Alphabet". The Spruce. Archived from the original on 28 Oct 2017. Retrieved 28 Oct 2017.
^UNGEGN Working Group on Romanization Systems (1 Mar 2016). "UN Romanization of Greek for Geographical Names (1987)". Institute of the Estonian Language. Archived from the original on 18 Oct 2017. Retrieved 28 Oct 2017.
^Panse, Sonal (1 May 2012). Finn, Wendy (ed.). "The Greek Alphabet: Where did It Come From & How Did It Become Modern Greek?". Bright Hub Education. Archived from the original on 22 Dec 2016. Retrieved 28 Oct 2017.
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