@Doubtful,
Quote:Is it mandatory to pluralize abbreviations?
Personally, I am of the opinion that there are no matters of refined detail that are "mandatory" in language. So long as your intended meaning gets conveyed, you're doing fine with the language (the objections of pedantic linguistic "purists" notwithstanding).
As a matter of convention, some abbreviations (and/or acronyms) in English are customarily treated as referring to both singular and plural. Others are not. But again, it's merely a matter of custom, not necessity.
Dizzy Dean, the hall of fame baseball pitcher, after being criticized for using the (non-standard) word "ain't," once said something like this (during the depression era):
Quote:I've never met anyone one who doesn't know what "ain't" means. I do know people who won't use that word, and a lot of them ain't eating.