http://afterdeadline.blogs.nytimes.com/2010/04/13/faqs-on-style/ http://afterdeadline.blogs.nytimes.com/2010/04/13/faqs-on-st... "A number of readers have comp

http://afterdeadline.blogs.nytimes.com/2010/04/13/faqs-on-style/ http://afterdeadline.blogs.nytimes.com/2010/04/13/faqs-on-st... "A number of readers have complained after seeing plural abbreviations like M.D.’s and M.R.I.’s in The Times. They say the apostrophe is wrong — that it indicates a possessive and should not be used in a plural like this. In fact, style rules at The Times (and some other publications, including the Chicago Manual of Style) do call for using an apostrophe in the plural of abbreviations that include periods. The idea is that a combination of uppercase letters, periods and a lowercase “s” is confusing at first glance, and that the apostrophe helps a reader see that the “s” has been added to make a plural." You might say that it should be GPA instead of G.P.A., but at least you can see that it was proofread.