This property defines the Unicodes which are of Private Use
Characters like ,,, etc. are listed under Private Use General Category.
3 Characters are present in Private Use General Category starting with the Unicode point U+E000 that represents the character .
Currently, as per latest version 15.0.0, Unicode supports 30 number of General Category. Here are a few examples - Close Punctuation,Connector Punctuation,Control Character, etc.