Charlie Self wrote...
Silvan writes:

On this topic though, I still can't decide how to properly handle things
like "He got straight A's" or similar. Gut says apostrophe for
pluralization is *always* wrong, but "He got straight As" just doesn't work
either. Best avoided as much as possible.

Apostrophe is wrong. The second choice may look wrong but it's right.


When needed to prevent confusion, the 's is used for the
plural of capital letters and of words referred to as words.

too many I's
several A's
two plus's
the ha ha's

-- Harbrace College Handbook, 10th Ed., p. 146