This property defines the Unicodes which belongs to High Private Use Surrogates block
Characters like , etc. are listed under High Private Use Surrogates Block.
1 Characters are present in High Private Use Surrogates Block starting with the Unicode point U+DB80 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.