Generally, a being that is not of this world. Recently, it is being used as an Intergalactic Council term to define special representatives of light, protectors of life, and lovers of planets. However, the term is essentially symbolic for any being who is feels aware of their spiritual purpose in this manner.
An Extraterrestrial prefers to use this term rather than the term higher self or soul. Extraterrestrials are capable of performing a walk-in (by permission), of a physical being. Others use the conventional method--through birth, and are termed Crawl-Ins.