U+11A58 "𑩘" Soyombo Vowel Sign Au Unicode Character

U+11A58 "𑩘" Soyombo Vowel Sign Au is a combining diacritical mark used in the Soyombo script, an abugida historically employed to write Mongolian and Tibetan, most famously in the Soyombo symbol on the Mongolian flag. This specific vowel sign represents the diphthong "au" and is written as a small, cursive hook-like mark that attaches to the top or side of a base consonant character, modifying its inherent vowel sound. It is part of the Soyombo block in Unicode, which was added to support the accurate digital preservation and display of this rare and culturally significant script.