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Tau

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https://en.wikipedia.org/wiki/Tau#Mathematics au  (uppercase  Τ , lowercase  τ ;  Greek :  ταυ   [taf] ) 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  / t aʊ /  or  / t ɔː / , [1]  but in  modern Greek  it is  [taf] . [2] [3]  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 ). Tau was derived from the  Phoenician letter   taw    (𐤕). [4]  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 ). Contents 1 Modern usage 1.1 Bio