I have suggested calling the total personality which, though present, cannot be fully known, the self. The ego is, by definition, subordinate to the self and is related to it like a part to the whole.
Jung’s foundational definition establishes the Self as the unknowable totality of personality, of which the ego is merely a subordinate part, and introduces the Self’s capacity to act upon the ego as an objective, quasi-external occurrence.
, Aion: Researches into the Phenomenology of the Self, 1951thesis