This property defines the Unicodes which are Modifying Letter
Characters like ஃ, etc. are listed under Modifying Letter Indic Syllabic Category.
1 Characters are present in Modifying Letter Indic Syllabic Category starting with the Unicode point U+0B83 that represents the character ஃ.
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.