A unique identifier for a particular Unicode character property.

• The identifiers used for property aliases contain only ASCII alphanumeric characters or the underscore character.
• Short and long forms for each property alias are defined. The short forms are typically just two or three characters long to facilitate their use as attributes for tags in markup languages. For example, "General_Category" is the long form and "gc" is the short form of the property alias for the General Category property. The long form serves as the formal name for the character property.
• Property aliases are defined in the file PropertyAliases.txt lists all of the non- Unihan properties that are part of each version of the standard. The Unihan properties are listed in Unicode Standard Annex #38, "Unicode Han Database (Unihan)."
• Property aliases of normative properties are themselves normative.