Akasha

Akasha is an aspect of paganism and wicca. It is the unifying energy that is inherent in every living creature on the planet, and in all of the 4 elements (earth, air, water, and fire) that make up the natural world as we know it. On the pentagram, akasha is assigned to the fifth point, and the "other" element. Essentially it is spirit: the human spirit and soul, and the all-encompassing spirit and energy of the Goddess and God.

Also called the quintessence, aether, or sacred sound.