INTJ (Introversion, Intuition, Thinking, Judgment) is an abbreviation used in the publications of the Myers–Briggs Type Indicator (MBTI) to refer to one of the 16 psychological types.
According to Myers–Briggs the INTJ represents "The Mastermind". INTJs are one of the rarest of the 16 psychological types and account for 2%—3% of the population.
https://www.16personalities.com/intj-personality