[3] It was an adaptation of the Aramaic alphabet used for texts with Buddhist, Manichaean and Christian content for 700–800 years in Turpan.

The Old Uyghur script was used between the 8th and 17th centuries primarily in the Tarim Basin of Central Asia, located in present-day Xinjiang Uygur Autonomous Region, China.

Letters join together at a baseline, and have both isolated and contextual forms, when they occur in initial, medial or final positions.

[1] Like the Sogdian alphabet (technically, an abjad), the Old Uyghur tended to use matres lectionis for the short vowels as well as for the long ones.

[6] Transliteration ʾ β w δ The Old Uyghur alphabet was added to the Unicode Standard in September, 2021 with the release of version 14.0.