Using the letters below, it is possible to have a unique 4 letter code to indicate each of the 16 Jungian personality types. Look at each and think about what you are. Are you E or I, N or S, T or F, and J or P.  Pick one from each group of two and come up with your 4 digit code.  Example ESTJ

Extroversion (E) --- Introversion (I)
Do you recharge your energy via external contact & activity (Extroversion) or spending time in your inner space (Introversion)?

Intuition (N) --- Sensing (S)
Do you rely on your inner voice (Intuition) or observation (Sensing)?

Thinking (T) --- Feeling (F)
When making decisions, what do you rely most on?  Your thoughts or your feelings?

Judgement (J) --- Perception (P)
Do you tend to set schedules and organize your life (Judgement), or do you tend to leave the options open and see what happens (Perception)?