This property defines the Unicodes which are Decimal Numbers
Characters like 0,1,2, etc. are listed under Decimal Number General Category.
680 Characters are present in Decimal Number General Category starting with the Unicode point U+0030 that represents the character 0.
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.