Tāʾ marbūṭa
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| Phonemic representation | t (also θ, s) | |||||||||
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| Position in alphabet | 22 | |||||||||
| Numerical value | 400 | |||||||||
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Taw, tav, or taf is the twenty-second and last letter of the Semitic abjads, including Phoenician Tāw 
, Hebrew Tav ת, Aramaic Taw 
, Syriac Taw ܬ, and Arabic Tāʼ ت (in abjadi order, 3rd in modern order). Its original sound value is /t/.
The Phoenician letter gave rise to the Greek tau (Τ), Latin T, and Cyrillic Т.
Taw is believed to be derived from the Egyptian hieroglyph meaning "mark"
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Wikipedia