https://en.wikipedia.org/wiki/Taw
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 ت Tāʼ (22nd in abjadi order, 3rd in modern order).In Arabic, it is also gives rise to the derived letter ث Ṯāʼ.Its original sound value is /t/.. The Phoenician letter gave rise to the Greek tau (Τ), Latin T, and Cyrillic Т