This property defines the Unicodes which belongs to Halfwidth and Fullwidth Forms block
Characters like ,!,", etc. are listed under Halfwidth and Fullwidth Forms Block.
233 Characters are present in Halfwidth and Fullwidth Forms Block starting with the Unicode point U+FF00 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.