Rational Self is a term used to describe the ability to think and act in a logical and reasonable manner. It involves being aware of one's own emotions and motivations, as well as understanding the consequences of one's actions. EGO, the 3 letter solution to the crossword, is a term used to refer to the conscious mind, or the part of the psyche that is responsible for self-awareness and identity. Rational Self is closely related to EGO, as it involves being aware of one's own thoughts and feelings, and making decisions based on them.