Tau
nineteenth letter of the Greek alphabet / From Wikipedia, the free encyclopedia
Tau (uppercase/lowercase Τ τ), is the letter of the Greek alphabet, used to represent the "t" sound in Ancient and Modern Greek. In the system of Greek numerals, it had a value of 300. Letters that came from it include the Roman T and Cyrillic Т.
This article is about the Greek letter. For the number, see Tau (mathematical constant).