Subnational entity is a generic name for an administrative region within a country (normally with a local government encompassing multiple municipalities, counties or provinces with a certain degree of autonomy in a varying number of matters. It is separate from other forms of dependent areas.
Designations
Some of the designations for subnational entities are:
... "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have two; only zero has just one square ...