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Originally Posted by JeremyR
The problem is that sometimes you are supposed to use an apostrophe when something is plural, when something is an abbreviation.
For instance, RPG's (role playing games) or NPC's (non player characters).
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Where is that presented as a grammatical rule?
I always write RPGs and NPCs.
Another example: if you
search Google for HGV's you don't see any examples of that apostrophe in the returned results, at least on the first few pages.
Road signs that mention HGV's always annoy me, and I'd be mortified if I find out that it's grammatically correct!
Edit: this site says that the apostrophe can be used with abbreviations, numbers or letters only where its use is helpful and unambiguous:
http://www.grammar-monster.com/lesso...reviations.htm
but goes on to note that:
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Very few grammar books condone the 's version.
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and states categorically that:
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Do not use apostrophes for the plurals of normal abbreviations.
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which would prohibit the use with RPG and NPC.
Graham