Shu was one of the Egyptian Nine Ennead. Shu was one of the primordial gods in Egyptian mythology, a personification of air, one of the Ennead of Heliopolis. He was created by Atum, his father and Iusaaset, his mother in the city of Heliopolis. Shu and Tefnut (his sister) mated and brought forth Geb, representing the earth, and Nut, representing the nighttime sky. His daughter, Nut, was the sky goddess whom he held over the Earth (Geb), separating the two. The Egyptians believed that if Shu didn't hold his son and daughter (the god of the earth and the goddess of the sky) apart there would be no way life could be created.
First Found on HGS Manual Page 76