This property defines the Unicodes which belongs to Indic Number Forms block
Characters like ꠰,꠱,꠲, etc. are listed under Indic Number Forms Block.
11 Characters are present in Indic Number Forms Block starting with the Unicode point U+A830 that represents the character ꠰.
Currently, as per latest version 15.0.0, Unicode supports 328 number of Block. Here are a few examples - Latin Extended E,Adlam,Aegean Numbers, etc.