33
votes
8answers
35k views

Plurals of acronyms, letters, numbers — use an apostrophe or not?

When I was in high school back in the 1970s, I was taught that to make a plural of an acronym, a letter, or a number, one should add an apostrophe and "s". Like I would have written this sentence, ...
0
votes
1answer
144 views

Pluralizing acronyms: how to? [duplicate]

Possible Duplicate: What is the correct way to pluralize an acronym? Let's say we're talking about PLCs (programmable logic controllers)? Or are they "PLC's"? I've seen it both ways!
14
votes
4answers
1k views

Why did they spell it “URL’s”?

I was reading this documentation file of some software and note the plural spelling of this abbreviation is “URL’s”. Why isn’t it “URLs”?