Ra-Horakhty combined the concepts of two gods, as often happened over Egypt's long ancient history.
The Ra aspect was the Sun god, and Horus was the god of sunrise and sunset, "Horus of the two horizons."
As shown in the picture, the falcon headed god carries and ankh and wears the solar disk and/or the double crown to represent Upper and Lower Egypt.
The royal cobra, Uraeus, is another of his symbols. Sometimes he was depicted as a crocodile with a falcon's head.