Myers–Briggs Type Indicator - Wikipedia
https://en.wikipedia.org/wiki/Myers–Briggs_Type_IndicatorThe MBTI is based on the influential theory of psychological types proposed by Swiss psychiatrist Carl Jung in 1921, who had speculated that people experience the world using four principal psychological functions—sensation, intuition, feeling, and thinking—and that one of these four functions is dominant for a person most of the time. The four categories are introversion/extraversion, sen…