New abbreviations? Do you mean the eight letters? Sorry lol
The 16 types are 16 variatiions on 8 different thinking processes and how they are ordered in a person’s mind. Some people don’t like that aspect of the theory, but personally I have found it more helpful than just letters. When I say something like “SJ” I mean somewone who is sensing instead of intuitive and a judging type instead of a perceiving type. There are only the eight options:
Introvert vs. Extrovert
Sensing vs. iNtuition
Feeling vs. Thinking
Perceiving vs Judging
Without getting into all the details of how it works, “xSxJ” (ESFJ, ISTJ etc) indicates that the person in question prefers a specific sensing process that is associated with their peperception of past personal experiences. People often make the mistake of believing they are sheep. Similarly people assume iNtuition must make you smarter, and thinkers must be smarter than feelers, but assume only feelers can have true empathy. Perceivers are all assumed to be messy and disorganized while judging types are assumed to be tidy and uptight.
It’s less about your personality however, and more about the way you process information. For example, a thinking type needs to spend more time sorting out their logic or their environment while a feeler needs to soend more time sorting out their values and relationships. But they are only preferences, so a thinker still needs to spend time on their emotions and relationships and vice versa.
Admittedly, it’s a fair bit more complicated than most people realize and potentially not worth your time, but since I learned it anyway, I have found use for it.