This property defines the Unicodes which belongs to Arabic Presentation Forms B block
Characters like ﹰ,ﹱ,ﹲ, etc. are listed under Arabic Presentation Forms B Block.
143 Characters are present in Arabic Presentation Forms B Block starting with the Unicode point U+FE70 that represents the character ﹰ.
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.