This property defines the Unicodes which are Avagraha
Characters like ऽ,ঽ,ઽ, etc. are listed under Avagraha Indic Syllabic Category.
17 Characters are present in Avagraha Indic Syllabic Category starting with the Unicode point U+093D that represents the character ऽ.
Currently, as per latest version 15.0.0, Unicode supports 36 number of Indic Syllabic Category. Here are a few examples - Avagraha,Bindu,Brahmi Joining Number, etc.