Atum

Atum was one of the Egyptian Nine Ennead. He was considered to be the first god, having created himself, sitting on a mound, from the primordial waters. Early myths state that Atum created the god Shu and goddess Tefnut by spitting them out of his mouth.

Atum's name is thought to be derived from the word tem which means to complete or finish. Thus he has been interpreted as being the 'complete one' and also the finisher of the world, which he returns to watery chaos at the end of the creative cycle. As creator he was seen as the underlying substance of the world, the deities and all things being made of his flesh or alternatively being his ka.

Reference
Wikipedia Ennead

Wikipedia Atum

First Found on HGS Manual Page 76