An ennead is a group or set of nine, as GB and I discovered recently having tried to fit 'noctet' into the answer to a crossword clue!
The original Ennead (Greek ἐννεάς, meaning a collection of nine things) 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.
Very interesting! Like you, I would have thought more along the lines of noctet or something containing nov as in November or nove (the Italian word for nine).
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