Narcissism is a factor in trait theory used in various self-report inventories of personality such as the Millon Clinical Multiaxial Inventory. It is one of the three dark triadic personality traits (the others being psychopathy and Machiavellianism). Except in the sense of primary narcissism or healthy self-love, narcissism is usually considered a problem in a person's or group's relationships with self and others. Narcissism is not the same as egocentrism. The term "narcissism" comes from the Greek myth about Narcissus (, ""), a handsome Greek youth who, according to Ovid, rejected the desperate advances of the nymph Echo. This caused Narcissus
Thalia (nymph) Thalia (nymph) In Greek mythology, Thalia or Thaleia ( ; "Tháleia" or Θάλια "Thália", "the Joyous, the Flourishing", from θάλλειν / thállein, "to flourish, to be green") is a nymph, the child of Hephaestus. She is also given as an anthropomorphic secondary deity of plant life and shoots, possibly as the culmination of the transmission of knowledge on volcanic ash's use as a fertiliser, characteristic of ancient viticulture in volcanic soils such as those of the island of Santorini. The tradition surrounding her is confused, but she is probably confused with the Muse, Grace or Nereid of the same name.