Ego and Non-Ego (i.e. I and Not-I, or Self and Not-Self), are terms used in philosophy to denote respectively the subjective and the objective in cognition, what is from self and what is from the external to self, what is merely individual and what is universal.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Egmont, Mount * Egoism