This property defines the Unicodes which belongs to Arabic Presentation Forms A block
Characters like ﭐ,ﭑ,ﭒ, etc. are listed under Arabic Presentation Forms A Block.
635 Characters are present in Arabic Presentation Forms A Block starting with the Unicode point U+FB50 that represents the character ﭐ.
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.