Economics Rankings

Aurelius
Sat, 13 May 2006 12:30:39 +0000

Actually both are acceptable - SATs, SAT’s, APs, AP’s all are correct. Because “SAT” and “AP” are acronyms, it is acceptable to use the apostrophe plural ['s]. Similarily, the ['s] plural can also be used on letters. (e.g. “He got 3 A’s this semester” is the same as “He got 3 As this semester.”)

However, the use without the apostrophe seems to be more popular nowadays, but the usage with the apostraophe is still considered acceptable.

Of course, for a non-acronym word, ['s] cannot be used for the plural.