Aquarius

This term is a proper noun referring to a specific astrological sign. It is used primarily within the context of astrology and horoscopes to describe a person's sun sign or the general characteristics associated with that period of the year.

Because it refers to a unique entity in the zodiac, it is treated as a singular proper noun. It does not function as a common noun and is not used in a countable sense to describe multiple different types of Aquarius.