What is ogdoad?

Ogdoad

In Egyptian mythology, the Ogdoad (Greek "ογδοάς", the eightfold) were eight deities worshipped in Hermopolis during what is called the Old Kingdom, the third through sixth dynasties, dated between 2686 to 2134 BC.

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Some articles on ogdoad:

Nu (mythology)
... In the Ogdoad cosmogony, the word nu means "abyss" ... As with the primordial concepts of the Ogdoad, Nu's male aspect was depicted as a frog, or a frog-headed man ... The Ogdoad includes with Naunet and Nun, Amaunet and Amun, Hauhet and Heh, and Kauket with Kuk ...
Ogdoad - In Gnosticism - 4 + 4
... The doctrine of an Ogdoad of the commencement of finite existence having been established by Valentinus, those of his followers who had been imbued with the Pythagorean ... The Valentinian Secundus divided the Ogdoad into a right-hand and a left-hand Tetrad (Iren ...
Maat As A Goddess
... to consume the earlier beliefs at Hermopolis about the Ogdoad, it was said that she was the mother of the Ogdoad and Thoth the father ... of the Egyptian pantheon and displaced Anubis in the Ogdoad tradition ...