In a previous question here What is the proper way to write the plural of a single letter? (another apostrophe question) someone asked what the plural of a letter is. The answer given was for uppercase letters use a lower case S with no apostrophe, but for lower case letters use an apostrophe for clarification.

What about when using the letter S? In either case, having Ss or s's looks odd. Would the plural be Ses or S's?

And when using uppercase letters that can become a word, such as Is and As, is no apostrophe okay or should an apostrophe be added for clarification?

This may be marked as duplicate for Plural of an initialism that ends with the letter S or similar questions concerning acronyms ending in S, but I believe this is different because I am asking about the letter itself, not an acronym.

  • What is your context?
    – Lambie
    Commented Apr 27, 2016 at 21:13
  • 1
    @Lambie For use in fiction writing. For example, a character that pronounces the letter S as a different letter. Also, for future reference.
    – akrs20
    Commented Apr 27, 2016 at 21:19
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    In Shaw's 'The Dark Lady of the Sonnets' Queen Elizabeth I characterizes the phrase "season your admiration for a space" as "a very vile jingle of esses". Commented Apr 27, 2016 at 21:28
  • The second answer to the first question you linked to says an apostrophe can be used "to form the plural of letters" without any restrictions on case.
    – herisson
    Commented Apr 27, 2016 at 21:30

3 Answers 3


You can avoid the confusion by pluralizing the name of the letter, ess, into esses.

She spent the afternoon ignoring the professor and drawing idly in her notebook, languidly doodling esses and then turning them into dragons.


I would use S's.

I want to spell apostrophes but I have no S's.


according the the Merriam-Webster dictionary there are two ways to write the plural for ´s´: 1. s's 2. ss

  • This is one of those American (S's) versus British/Commonwealth (Ses) things. I once had a long argument with a teacher from New Zealand over this. She refused to accept this sole exceptional case for apostrophes in plurals as anything but a barbarism, even when I showed her sources.
    – Spencer
    Commented Apr 28, 2016 at 0:08

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