Ennead

The Ennead (Ancient Greek: ἐννεάς, meaning "group of nine") was a group of nine deities in Egyptian mythology. The Ennead were worshipped at Heliopolis and consisted of the god Atum, his children Shu and Tefnut, their children Geb and Nut and their children Osiris, Isis, Set, and Nephthys.

Egyptian mythology established multiple such groupings of deities, known as Pesedjets. The Pyramid Texts of the 5th and 6th dynasties mention the Great Pesedjet, the Lesser Pesedjet, the Dual Pesedjet, plural Pesedjets, and even the Seven Pesedjets. Some pharaohs established pesedjets that incorporated themselves among the deities. The most notable case is Seti I of the 19th dynasty, who in his temple at Redesiyah worshipped a pesedjet that combined six important deities with three deified forms of himself. Ennead may have represented Pleiades in the prognosis texts of the Calendar of Lucky and Unlucky Days of papyrus Cairo 86637.

The Greek term Ennead, denoting a group of nine, was coined by Greeks exploring Egypt, its culture and religion, especially after the conquest by Alexander the Great and during the subsequent rule of the Ptolemaic Dynasty. Greek became the language of learned studies and hence Greek terms were used by Greek and Roman authors to describe Egyptian phenomena. These others also made use of parallels between Egyptian and Greek deities to identify the two.

...
Wikipedia