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Answers · 6

1
Yes, technically speaking, it is still grammatically correct since one of the uses of apostrophe is to form the plural of letters or symbols. Example: w's, !'s, or like what you used here, *'s
1
Depending on the context, I probably wouldn't know what you meant if I saw *'s. This might also be confusing because asterisks are sometimes used to obscure rude words in English.

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