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Apostrophes for the Plurals of Abbreviations and Awkward Plurals
The Quick Answer
If you have an awkward plural (usually the plural of a letter, a number, or an unusual abbreviation), you can use an apostrophe to assist your readers. For example:- Hawaii is spelt with two i's.
- She used six and's in one sentence.


Apostrophes to Show the Plurals of Abbreviations and Awkward Plurals
The first thing to make clear is that apostrophes are not normally used for forming plurals. (This is covered more in the lesson Apostrophe Errors with Plurals.)In other words, using an apostrophe to form a plural is usually a grammatical mistake. For example:
- She will not eat banana's.
- Is it true that pearl's melt in vinegar?
- There are two a's in accommodation.
- Your 2's look like your 7's.
Assist your Reader
The advantage of using an apostrophe is that the abbreviation, letter, or number is instantly recognizable. However, when an apostrophe is used to show a plural, it could lead to ambiguity because apostrophes are mostly used to show possession (e.g., the dog's bone) or in contractions (e.g., the dog's eaten the bone). Look at these examples:- MP's Plan Failure
- The MP's leaving are to be replaced by Monday.
You should only use an apostrophe in the plural of an abbreviation, a letter, or a number to assist your reader.
Examples of Apostrophes Showing Plurals
Here are some acceptable examples featuring apostrophes for plurals.- You use too many and's in your writing.
- There are two consecutive i's in the words skiing and taxiing.
Apostrophes in Plurals for Uppercase-Only Titles
When writing titles, you are sometimes compelled to use just capital letters. This makes it difficult to show a plural of an otherwise normal-looking abbreviation. Remember that if it assists your reader, you can use an apostrophe to show a plural. For example:- CD'S ARE OBSOLETE
- TWO LRS'S PER PROCESSOR
Do not Use an Apostrophe for the Plural of a Normal Abbreviation
It is worth reiterating this point. Do not use apostrophes for the plurals of normal abbreviations. For example:- He had 4 CCJ's against him.
- He had 4 CCJs against him.
- M.O.T.'s
- M.O.T.s
- MOT's
- MOTs
Do Not Try Too Hard to Avoid the Apostrophe
Of course, there are other ways to show an awkward plural. For example:- Hawaii is spelt with two "i"s.
- Hawaii is spelt with two Is.
- She used six ANDs in one sentence.
- She used six ands in one sentence.
Key Point
Some grammar pedants claim that apostrophes cannot be used in any plurals. This is an outdated, dogmatic view. However, using an apostrophe for a plural is still an unpopular convention, and it could irk some of your readers. Therefore, you should try to avoid it.
The ruling, however, is that you can use 's to show an awkward plural. So, if you have an awkward abbreviation, number, or letter and adding 's gives you the best-looking plural, go for it.
The ruling, however, is that you can use 's to show an awkward plural. So, if you have an awkward abbreviation, number, or letter and adding 's gives you the best-looking plural, go for it.
Interactive Exercise
Here are three randomly selected questions from a larger exercise, which can be edited, printed to create an exercise worksheet, or sent via email to friends or students.- Do you disagree with something on this page?
- Did you spot a typo?