This property defines the Unicodes which belongs to Specials block
Characters like ,,, etc. are listed under Specials Block.
7 Characters are present in Specials Block starting with the Unicode point U+FFF9 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.