Myers-Briggs typology
I like taking this test periodically to monitor how I change over the years. The result is consistent on the classification, though the percentages vary.
Your Type is
INTJ
Introverted – 67%
Intuitive – 75%
Thinking – 88%
Judging – 11%
INTJ type description by D.Keirsey
INTJ type description by J. Butt and M.M. Heiss