Anattā, Sanskrit anātman, is the doctrine that none of the five aggregates, nor anything else that is conditioned, is a self, something permanent, independent and under one’s control. It is not a theory that no one exists but a way of loosening the clinging to I and mine, and its realization is liberating.
Anattā
Not-self: the teaching that no permanent, independent self is found in body or mind.
Also: Anatman, not-self