Tau (/ˈtɔː, ˈtɒ, ˈtaʊ/; uppercase Τ, lowercase τ or Greek: ταυ [taf]) is the nineteenth letter of the Greek alphabet, representing the voiceless dental or alveolar plosive IPA. In the system of Greek numerals, it has a value of 300.
The name in English is pronounced /taʊ/ or /tɔː/, but in Greek it is [taf]. 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).
The tau cross is a T-shaped cross, sometimes with all three ends of the cross expanded. It is called a “tau cross” because it is shaped like the Greek letter tau, which in its upper-case form has the same appearance as Latin letter T.
Another name for the same object is Saint Anthony's cross] or Saint Anthony cross, a name given to it because of its association with Saint Anthony of Egypt.
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