A word or phrase contained within parentheses that are added to hierarchy labels, schema names, or product terms that provide additional context to the term that may be used in multiple places within the hierarchy to distinguish the terms.
The same term may be used multiple places in a hierarchy but is used in different contexts. Adding a parenthetical to the terms avoid confusion and duplication of the terms. And example is Mercury (planet) or Mercury (car brand).
Category Labeling, Over Qualifying