TheMarkster wrote: ↑
Wed Mar 18, 2020 4:34 pm
In baseball we have a stat called RBI (runs batted in). If a player has 2 runs batted in that is sometimes referred to as 2 RBI and sometimes 2 RBI's. Most people will say he had 2 RBI.
Manuals of style indicate that acronyms should be pluralized just like normal words, by adding an S at the end, but no apostrophe.
So, RBI is pronounced "arr-bee-eye", so it should be pluralized RBIs, "arr-bee-eyes". However, this is not traditional done with many acronyms. So RBI can be used with both singular and plural meanings.
Adding the apostrophe is incorrect, except when talking about possessives. However, the Internet has distorted everything, and now people add apostrophe's like crazy, even to normal plural's. It is not uncommon to see many error's like these.
So, RBI's should not be correct.
It's GIFs, not GIF's. It's DOFs not DOF's. It's FAQs, not FAQ's.
You can add an apostrophe to a plural but only in one situation, when talking about single letters. So A's, B's, C's, is correct when talking about many single letters, "I got A's and B's in my tests".