Your idea of yourself, as distinct from your Self, which needs no description or formulation. Similar to self-image. The complex of thought patterns and ideas that you consider to be "you."

Problem is, the ego can be observed. It can be looked at, thought about, and manipulated. If this is the case, who is it that is doing the looking, the manipulating? Whoever that is, it must be something other than the ego. Is that you?