When there's a new teacher, it says 'ZZ TEACHER AS' or something like that. Why?

Question

Or more specifically, what does the ZZ stand for?

Answer 1

If this is on your schedule, it means that, at the time of printing, the teacher for your class had not yet been assigned. At least that's what such things at my school mean. One year my students had me listed as Teacher Eng, meaning Teacher of English. Differents school use different codings, though.