Nun
(Nu)
The
primeval water that encircles the entire world, and from
which everything was created, personified as a god.
He
is considered to be a more ancient god then the sun-god
Re, who arose from this water.
He
is called 'father of the gods', which refers to his primacy
rather than literal parentage. With the goddess Naunet
he forms a pair in the Ogdoad of
Hermopolis.
Nun
played no part in religious rituals and had no temples dedicated
to him. He was symbolized by the sacred lakes associated
with certain temples, such as the ones at Dendera and Karnak.
Nun
is depicted in human form holding the solar barque above
his head.
The
name of Nun in hieroglyphs: 
Source(s):
Encyclopedie van de Mythologie.
The
Encyclopedia Mythica