Sia or Saa, an ancient Egyptian god, was the deification of perception in the Heliopolitan Ennead cosmogony and is probably equivalent to the "intellectual energies of the heart of Ptah in the Memphite theology.

"[1] He also had a connection with writing and was often shown in anthropomorphic form[2] holding a papyrus scroll.

[1][3] In ancient Egyptian mythology, Sia was believed to have been created from blood that dripped from the phallus of Ra.

[1][3] In the New Kingdom, Sia is depicted in the solar barque in the underworld texts and tomb decorations, together with Hu, the "creative utterance," and Heka, the god of magic.

[1][2][3] These gods were seen as special powers helping the creator, and although Heka had his own cult Sia did not.