This property defines the Unicodes which belongs to Arabic Extended C block
Characters like 𐻽,𐻾,𐻿, etc. are listed under Arabic Extended C Block.
4 Characters are present in Arabic Extended C Block starting with the Unicode point U+10EFD that represents the character 𐻽.
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.