This property defines the Unicodes which are Vowel Independent
Characters like ऄ,अ,आ, etc. are listed under Vowel Independent Indic Syllabic Category.
500 Characters are present in Vowel Independent Indic Syllabic Category starting with the Unicode point U+0904 that represents the character ऄ.
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.