Shu
The
embodiment of the sky.
In
the Ennead of Heliopolis he is
the son of Atum and brother-husband
of Tefnut. He was one of the first
deities to be created by Atum, either from his semen or
the muscus of his notrils.
With
Tefnut he became the father of Nut
(the sky) and Seb (the earth). He
raised the body of his daughter high above the earth and
separated thus heaven and earth.
The
connection of Atum and Re, as Atum-Re,
makes Shu a 'son of Re' and as such the brother of the Egyptian
king (who calls himself a 'son' as well.
Shu
is depicted in human form wearing an ostrich feather (the
hieroglyph for his name), with his arms raised to support
Nut above the supine form of her brother Geb.
The
name of Shu in hieroglyphs: 
Source(s):
Encyclopedie van de Mythologie.
The
Encyclopedia Mythica