It could be that they know how to use the dark triad of personality traits: manipulativeness, narcissism, and antisocial behavior.
Time(Jul 10, 2014)
The stealthy subs, called “boomers,” are one leg of the nation’s nuclear triad, which also includes long-range bomber aircraft and land-based missiles.
Washington Times(Jul 09, 2014)
The data pointed to a ‘functional personality’ triad of conscientiousness, emotional stability and agreeableness.
Forbes(Jul 08, 2014)
But this patient had something that few of those patients had: a documented Whipple’s triad.
New York Times(Jul 03, 2014)
Frempong described them as the classic "triad" of symptoms: eyelid spasms, sensitivity to light and excessive tearing.
US News(Jul 02, 2014)