Arrakis, (derived from the Arabic name ar-rāqiṣ, "the dancer", originally a star-name for Mu Draconis) later Rakis (known colloquially throughout as Dune), is a desert planet home to the Fremen (Zensunni wanderers) and later, the Imperial Capital under Paul "Muad'Dib" Atreides. Arrakis is the third planet orbiting the star Canopus, and it in turn is orbited by two moons, one of which has the image of the desert kangaroo-rat, Muad'Dib, on it; the other possesses the image of a human fist. The planet is the only known source of the all-important spice melange in the universe. By the time of Heretics of Dune, its name has been shortened to "Rakis."
Read more about this topic: List Of Dune Planets