Helios

This term refers specifically to the divine personification of the sun in Greek mythology. It is a proper noun and is used exclusively to denote this specific mythological figure, distinguishing him from the general concept of the sun or other solar deities in different pantheons.

Because it is a proper name for a unique entity, the word does not have a plural form and is not used as a common noun. It typically appears in contexts discussing classical mythology, ancient Greek literature, or art history.