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 canonical definition establishes the Self as the unknowable totality of personality, with the ego as a subordinate part that encounters the Self as an objective, quasi-external force.
, Aion: Researches into the Phenomenology of the Self, 1951thesis