Does anyone else want to stop using the same acronyms that MBTI uses? One of the reasons is the confusion; people have a habit of interchanging them which should probably not be be done.
Saying something like "Sensory-logical Introvert" works. (Socionics.com has also used something like "Introverted Sensor with Thinking".)
If that is too long to write, and you want an abbreviation, SiTe works.