Personal identity is a concept that refers to an individual's unique characteristics, such as their name, physical appearance, and personality. ONESELF is a seven-letter word that is used to refer to ONESELF, or one's own SELF. SELF is a four-letter word that is also used to refer to ONESELF, but it is more commonly used in the context of one's identity or sense of SELF. Both words are used to refer to the same concept, which is personal identity.