When I say 16 types, I don't mean the forum, but the root idea of 16 personality types of four letters, which would include socionics, MBTI and Jung's functions. A few days ago I overheard some teenagers talking about it in the bus like it was common knowledge and it caught me off guard because I felt that it was an esoteric-like knowledge to be aware of the 16 personality types. Anyone else noticing this trend?