There is no absolute rule in English, and this is the only absolute rule. Did I just blow your mind? Well stay tuned, ‘cos I’m about to do it again: you can use apostrophes to pluralize some things!
I can tell by your expression that you think I am pulling your leg. Nope. That’s not me.
Use apostrophe-s’s to pluralize lowercase letters. For example: Use apostrophe-s’s to pluralize lowercase letters.
Use apostrophe-s’s to pluralize abbreviations. For example: Make sure all the etc.’s have a period attached.
I said in this post to never pluralize nouns with an apostrophe-s. Please note that this is incomplete. I’m sorry for misinforming anyone.
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