This property defines the Unicodes which are Nukta
Characters like ़,়,਼, etc. are listed under Nukta Indic Syllabic Category.
32 Characters are present in Nukta Indic Syllabic Category starting with the Unicode point U+093C that represents the character ़.
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.