how many possible psychological types are there with the mbti?

There are 16 possible psychological types in the Myers-Briggs Type Indicator (MBTI) system. These types are formed by combining four pairs of opposite preferences: Extraversion (E) vs. Introversion (I), Sensing (S) vs. Intuition (N), Thinking (T) vs. Feeling (F), and Judging (J) vs. Perceiving (P). Each person is identified by a unique four-letter code representing their preferences from each pair, such as ISTJ or ENFP, resulting in a total of 16 distinct personality types.