Ṯāʼ

Arabic alphabet
ﺍ ﺏ ﺕ ﺙ ﺝ ﺡ
ﺥ ﺩ ﺫ ﺭ ﺯ س
ﺵ ﺹ ﺽ ﻁ ﻅ ﻉ
ﻍ ﻑ ﻕ ﻙ ﻝ
ﻡ ﻥ ه‍ ﻭ ﻱ
History · Transliteration Diacritics · Hamza ء Numerals · Numeration v • d • e

Ṯāʼ (ﺙ) is one of the six letters the Arabic alphabet added to the twenty-two inherited from the Phoenician alphabet (the others being ḫāʼ, ḏāl, ḍād, ẓāʼ, ġayn). It represents the voiceless dental fricative (IPA: [θ]). In name and shape, it is a variant of tāʼ.

Position in word:	Isolated	Initial	Medial	Final
Form of letter:	ﺙ	ﺙـ	ـﺙـ	ـﺙ

Common Semitic perspective

The choice of the letter Tāʼ as the base for this letter was not due to etymology (see History of the Arabic alphabet). (Rather, obviously, it was chosen due to phonetic similarity.) For other Semitic cognates of the phoneme /ṯ/ see Proto-Semitic language#Sound changes between Proto-Semitic and the daughter languages.

The South Arabian alphabet retained a symbol for /ṯ/.