The Rational temperament is one of the four temperaments defined by David Keirsey, correlating with NT (intuitive–thinking) Myers-Briggs types (Architect INTP, Fieldmarshal ENTJ, Inventor ENTP, Mastermind INTJ), the smallest temperament group, only 5%-10% of the general population. by JasonCarswell in INTP

[–]JasonCarswell[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

I had to look it up again, but I think I'm an INTP, the Architect, though I'm irrational more than I'd like, often via bipolar.