U+115BA "𑖺" Siddham Vowel Sign O Unicode Character

U+115BA "𑖺" Siddham Vowel Sign O is a combining diacritical mark used in the Siddham script, an ancient Indian writing system historically employed for writing Sanskrit and Buddhist texts, particularly in East Asia. This vowel sign modifies a consonant character to indicate the long vowel sound "o", functioning as a dependent vowel that is placed above or around the base consonant letter. It is part of the Siddham block in Unicode, which was added to support the preservation and digital representation of this important historical script used in temples, manuscripts, and calligraphy, especially within Japanese Shingon Buddhist traditions.