INTJ - "Mastermind". Introverted intellectual with a preference for finding certainty. A builder of systems and the applier of theoretical models. 2.1% of total population.
I have always been facinated with the Meyers-Briggs typology. Mainly, that it tends to really describe people and is very re-testable. I've hovered between an INTP and an INTJ since I have been interacting with psychology. Most notable, I've always scores between 45-55% on both the perceiving and judging, so the test would seem to indicate that I'm borderline between those two.