U+A86A "ꡪ" Phags-Pa Letter Ttha Unicode Character

U+A86A "ꡪ" Phags-Pa Letter Ttha is a distinctive glyph from the Phags-pa script, a writing system devised in the 13th century by the Tibetan monk and state preceptor Drogön Chögyal Phagpa for the Mongol Yuan dynasty to uniformly write multiple languages, including Mongolian, Chinese, and Tibetan. This specific character represents an aspirated retroflex stop consonant sound, similar to the "th" in "thumb" but with the tongue curled back, and was used in transliterating Sanskrit and other languages into the script. Primarily of interest to historical linguists and scholars of East Asian writing systems, the letter Ttha appears in ancient texts and inscriptions that document the linguistic and administrative breadth of the Mongol Empire.