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When making acronyms, initial-isms or abbreviations plural, no apostrophe is required -- IRAs, RFPs, CDs, FAQs, NSAIDs.
Note that these are all multi-letter names that are treated as nouns in every way, including in their plural form.
The exception is when discussing multiple occurrences of a single letter of the alphabet, like so: "Mary's handwriting has improved; her e's are now distinct from her i's."
This exception is important when you consider that the apostrophe makes it clear that it is a letter of the alphabet under consideration, and not the word, "is."
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