Atum

Atum (alternatively spelled Tem, Temu, Tum, and Atem) is an important deity in Egyptian mythology, whose cult centred on the city of Heliopolis. His 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 gods and all things being made of his flesh or alternatively being his kas.
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n. tuna, tunny

[Egyptian] The primeval Egyptian sun god and creator of the world. He is the evening aspect of the sun, representing the setting sun. Later he was syncretized with Re as the god Atum-Re. According to the myths, he was the first substance (a hill) who emerged from the primeval waters. Amut created the deities Shu and Tefnut from his spittle or from his semen in the act of masturbation. Atum was especially worshipped at Heliopolis, where he was the head of the Ennead cult. He was represented by the black bull Mnewer, who bore the sun disk and uraeus between its horns. As the father of the pharaoh, he played an important part in the coronation rites. Atum was depicted as old man symbolizing the setting sun, but he also appeared also a snake, a scarab, and a mangust (pharaoh hat). The snake, bull, lion, lizard and ichneumon are his sacred animals. The Memphite creation myth stated that Atum was conceived in the heart of Ptah and was created by his word. Literally, "he who completes, or perfects".

Atum (Egyptian) Adam of the Egyptians {BCW 9:20-1; 14:204}.

Atmu, Atum (Egyptian) [from tem to make an end of, complete] Also Tem, Tum, Temu. A form of the sun god, represented as bringing the day to its close, thus associated with the evening sun -- whether of our ordinary day, or of the ending of a manvantara. "I am the god Tem, the maker of the sky, the creator of things which are, who cometh forth from the earth, who made the seed of man to come into being, the Lord of things, who fashioned the gods, the Great Gods, who created himself, the Lord of Life, who made to flourish the Two Companies of the Gods. . . . My coming is like unto that god who eateth men, and who feedeth upon the gods" (Egyptian Book of the Dead, Budge 258-60).
The Egyptian god Tem is connected by Blavatsky with fohat, for Tem is "spoken of as the Protean god who generates other gods and gives himself the form he likes; the 'master of life' 'giving their vigour to the gods' (chapter lxxiv.) He is the overseer of the gods, and he 'who creates spirits and gives them shape and life'; he is 'the north wind and the spirit of the west'; and finally the 'Setting Sun of Life,' or the vital electric force that leaves the body at death, wherefore the defunct begs that Toum [Tem] should give him the breath from his right nostril (positive electricity) that he might live in his second form" (SD 1:673-4).