On Tue, 20 Dec 2016 09:13:32 +0000, Moron Watch wrote:

So that however old you are, no matter how many years you've already
been gracing the planet with your presence, you're still not aware of
the function of the apostrophe in replacing missing letters ?

That is true.

However, the use of an apostrophe in pluralising acronyms is much less
clear.

Go back some years, and it was very common (read Burchfield's third
edition of Fowler's 'Modern English Usage'). It is still in use and
arguably is not suddenly wrong.

I personally don't use it, but I wouldn't condemn someone who did. I
certainly wouldn't insult them.

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