U+115AF "𑖯" Siddham Vowel Sign Aa Unicode Character

U+115AF "𑖯" Siddham Vowel Sign Aa is a combining vowel mark used in the Siddham script, an historical abugida primarily employed for writing Buddhist texts in East Asia, particularly in Japan, where it is known as Shittan or Bonji. This specific sign modifies a consonant to represent the long vowel "ā" (as in "father"), functioning as a diacritic that is attached to the base consonant character. As part of the Siddham block in Unicode, it aids in the accurate digital preservation and rendering of classical Buddhist manuscripts and ritual inscriptions, bridging ancient calligraphy with modern text processing.