Thanks to Jen for pointing this out:
The name Shu means “he who rises up”. As the god of air and a god of light, or of light personified, Shu was said to make himself manifest in the beams of the Sun by day and in the light of the Moon by night. He appears as rising up from behind the earth while supporting the sun with his hands similar to the way Atlas can be seen supporting the heavens on his shoulders. Shu is the son of Atum-Ra, the husband of the goddess Tefnut and father of Nuit and Geb. It is said that Shu was created by Ra by way of masturbation. “I had union with my hand, and I embraced my shadow as a wife. I poured seed into my own mouth and I sent forth from myself issue in the form of the gods Shu and Tefnut.” Egyptian Story of Creation.