Top us vacation destinations on (symbol: I) a mathematical operation involving the addition of numbers, quantities, or the like. sum of squares the total obtained by adding together the squares of each deviation score in a sample (i.e., each score minus the sample mean squared, and then added together). superego n. in psychoanalytic theory, the moral component of the personality that represents society’s standards and determines personal standards of right and wrong, or conscience, as well as aims and aspi- rations (see ego-ideal). In the classic Freudian tripartite structure of the psyche, the ego, which controls personal impulses and directs actions, operates by the rules and principles of the superego, which basically stem from parental demands and prohibitions. Top us vacation destinations 2016.