A property of abstract characters.

• Abstract character properties refer to attributes of abstract characters per se, based on their independent existence as elements of writing systems or other notational systems, irrespective of their encoding in the Unicode Standard.
• Thus the Alphabetic property, the Punctuation property, the Hex_Digit property, the Numeric_Value property, and so on are properties of abstract characters and are associated with those characters whether encoded in the Unicode Standard or in any other character encoding—or even prior to their being encoded in any character encoding standard.