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Message: <blockquote data-quote="Half Empty" data-source="post: 751161" data-attributes="member: 10288">It appears that there is no definitive answer, much as with the Oxford comma.  However, it's refreshing to see someone really want to know - it's tough taking folks seriously when their right to abuse the language in a way that would get my special needs grandson reprimanded in 3rd grade is defended.  My choice for an answer (indicating that you're correct in your use) is:Rule 6. There are various approaches to plurals for abbreviations, single letters, and numerals.Many writers and editors prefer an apostrophe after single capitalized letters.Example: I made straight A's.(grammarbook.com)</blockquote>

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