I have seen where they put it that way for several reasons.
One reason is that the teacher might not want her college and disicpline listed for a number of reasons.
Another might be like a PP said, they have a subject matter diploma, but not a BA or BS. (I have seen that when say, a teacher is teaching aircraft maintence, he has diplomas certified by the FAA, and so forth.)
Another reason is that the teacher had not given the school the OFFICAL transcripts of her degree by the time the printers needed the information. Rather than leave it blank, they elected to put a generic term, but did not want to say he/she had the degree without verification. (yes, some teachers have falsified their credentials and/or degrees)