Symbol formation.
D006801:Humans; D009497:Neurotic Disorders / Q000523:psychology; D011573:Psychoanalytic Interpretation; D011575:Psychoanalytic Therapy; D011618:Psychotic Disorders / Q000523:psychology; D012094:Repression, Psychology; D012660:Semantics; D013561:Symbolism; D014473:Unconscious, Psychology