<VV> FYI for clarity - Avoid apostrohes for plurals

[Joel McGregor]

I've always wondered so I looked it up:



Avoiding Apostrophes for Plurals

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In general, don't use an apostrophe to indicate a plural. The wrong use of an apostrophe to form the plural is called the greengrocer's apostrophe, since grocers are often the worst (or at least the most visible) offenders. If you have more than one apple, then write apples, not apple's.
    *   An occasional exception to this use is in the case of making a single letter plural. Therefore, Why are there<http://www.wikihow.com/Use-There%2C-Their-and-They%27re> so many i's in the word "indivisibility"? is correct, depending on who you ask. This is simply for clarity reasons, so the reader does not mistake it for the word "is." However, in modern usage, the preference is to avoid inserting an apostrophe and instead surround the single letter in quotation marks before pluralizing it: Why are there so many "I"s in the word "indivisibility"?
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Know how to use apostrophes for acronyms and years. Say you use an acronym for a noun, like CD. To make CD plural, use "CDs," not CD's." The same logic goes for years - instead of writing "Spandex was popular in the 1980's," use "1980s."
    *   The only time an apostrophe should be used in a year is if it's standing in for omitted numbers. For instance, if you wanted to shorten the year 2005, you could write '05. In this case, the apostrophe is essentially acting like it does in a contraction and serving as shorthand.

>From http://www.wikihow.com/Use-Apostrophes
Joel McGregor