This business of adding "apostrophe s" to irregular words, like numerals, letters and acronyms, to form the plural is problematic. (It doubtless encourages people to add "apostrophe s" to form plurals willy nilly. I mean, "Barry's Bus's" for heaven's sake!) I don't know exactly how or why it (meaning "apostrophe s" on irregular words) arose, but it is common and arguably correct in some situations. Perhaps the apostrophe is supposed to stand for the missing words in an abbreviation, eg. "You should be careful how you pluralise TLA's". Here the apostrophe might be said to stand for the missing part of "acronym".
I follow the slippery-slope principle and never use apostrophes in forming plurals.



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