This property defines the Unicodes which are Uppercase Letters
Characters like A,B,C, etc. are listed under Uppercase Letter General Category.
1831 Characters are present in Uppercase Letter General Category starting with the Unicode point U+0041 that represents the character A.
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.