This property defines the Unicodes which belongs to Private Use Area block
Characters like , etc. are listed under Private Use Area Block.
1 Characters are present in Private Use Area Block starting with the Unicode point U+E000 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.