This property defines the Unicodes which do not have any General Category
Characters like ,,, etc. are listed under Unassigned General Category.
780 Characters are present in Unassigned General Category starting with the Unicode point U+FDD0 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.