The letters in MBTI don ' t have any meaning of their own , they are just a reference to some function stack . INTP just means Ti Ne Si FeISTJ just means Si Te Fi NeINTJ just means Ni Te Fi SeBoth INTP and ISTJ have Si and Ne . Both INTJ and ISTJ have Te and Fi . Read about the functions , figure out which ones you got in the grand ole ' MBTI lottery of the universe . <| sep |> Magic mirror on the wall , who ' s the tallest of them all ? <| sep |> So this reminds me of a writing class I took in college . The prof asked us to leave our emails for her after class one day . Next day she shows up , and she says you know . some of you have to work on getting more professional emails . Maybe try your name . I do not want to add pussylicker 69 to my address book . . I was equally shocked ans offended . She was about 40 or so , I just did not expect to hear someone like her ever say pussy , especially when leading a class .