INTP - "Architect". Greatest precision in thought and language. Can readily discern contradictions and inconsistencies. The world exists primarily to be understood. 3.3% of total population.
Given that by profession I'm a software and systems architect, specialising in real-time and safety-critical systems where even the smallest error can cause disaster - pretty accurate, I'd say.
This and other personality tests - varying from the sublime to the ridiculous - are also available via the link above.