The plurals of symbols, letters, numbers, and words discussed as words are formed by adding an apostrophe and an s.
Using &'s, @'s, and %'s in place of the words and, at, and percent will save room in this report. Don't forget to cross your t's. And, avoid using too many and's in your writing.
Note: It is permissible to omit the apostrophe when the omission does not cause confusion, but be consistent. Also, spelled-out numbers do not require an apostrophe.
DVD's or DVDs
fives and sixes
(From Write for Business, page 210, and Proofreader's Guide PDF, page 22)
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