It's funny, I pronounce the shorthand for both introverted and extroverted functions with a long 'e' sound. So Si and Se are both pronounced as "See".
Not sure if I'm the only one, but I've never had discussions about this stuff offline to the point where we would talk functions.
So how do you talk it if you do at all?
Or do you spell it out?
Inquiring minds want to know.