ennead

An ennead could mean any group of nine deities that operate together, but the most well known is the Great Ennead of Heliopolis.

A group of nine is called an ennead.

The number Nine, or the ennead, being the multiple of three, should be regarded as sacred.

His arrangement by enneads, or series of nine, is fanciful, and wanting in inner principle.

Generally there are three; in many places there is an ennead, a nine of gods, but the nine is a round number; there might be one or two less or more.