Shu (meaning: void) was the very old god of the cool and dry air, who se- parated the earth from the sky. In that capacity he was responsible for gene- rating the wind. He was often shown standing up supporting his daugther sky goddess Nut (see her) as a vault over the whole horizon on the command of the sun god Re. With his twin sister Tefnut (humid warm air) he was a members of the old family in Heliopolis.
Sometimes he was sitting on a throne (picture upper right) wearing a crown with plumes and horns topped with a sun disc, or just a feather. Normally he was a man wearing a band with a feather (picture left) but in some provinces he could also show himself as a lion.
The Ennead Creation of Universe