ASCII Character ث
Arabic letter ThehṮāʾ (ث) is one of the six letters the Arabic alphabet added to the twenty-two from the Phoenician alphabet (the others being ḫāʾ, ḏāl, ḍād, ẓāʾ, ġayn). In Modern Standard Arabic it represents the voiceless dental fricative [θ], also found in English as the "th" in words such as "thank" and "thin". In Persian, Urdu, and Kurdish it is pronounced as s as in "sister" in English. In name and shape, it is a variant of tāʾ (ت). Its numerical value is 500 (see Abjad numerals).