The fifth Classical Element is known by various names: Aether , Idea, quintessence, or (Greek hieron "a divine thing"). Aether is Greek for “upper sky” or in mythology, the divine air that only the gods inhale.
According to ancient and medieval science, Aether , also spelled ether, is the material that fills the region of the universe above the terrestrial sphere. Aristotle included;, idea, as a fifth element distinct from the other four, Earth, Water, Air, and Fire.