This property defines the Unicodes which are Surrogates
Characters like ,,, etc. are listed under Surrogate General Category.
3 Characters are present in Surrogate General Category starting with the Unicode point U+D800 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.