Narcissism is also considered a social or cultural problem. It 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 (Greek: Νάρκισσος, Narkissos), a handsome Greek youth who, according to Ovid, rejected the desperate advances of the nymph Echo. This caused Narcissus to fall in love with his own reflection in a pool of water. Unable to consummate his love, Narcissus "lay gazing enraptured into the pool, hour after hour," and finally changed into a flower that bears his name, the narcissus. The concept of excessive selfishness has been recognized throughout history. In ancient Greece the concept was understood as hubris. It is only more recently that narcissism has been defined in psychological terms.
—Alexander Lowen describing the existence of a narcissist
A 2012 book on power-hungry narcissists suggests that narcissists typically display most, and sometimes all, of the following traits: