Take the 2-minute tour ×  Possible Duplicates: What is the
correct way to pluralize an acronym? What is the proper way to
indicate possession when using an abbreviation such as Dr.?  An
example:  Most DD's have good packaging skills.  How did things
come to that instead of:  Most DDs have good packaging skills.
Compare that to:  Most Debian Developers have good packaging
skills.  [update] This question was asked with the presumption
that the first example is correct, so I was surprised to find
that it isn't the case.  share|improve this question  marked as
duplicate by RegDwigнt, Robusto, kiamlaluno, nohat Feb 3 '11 at
18:41   They don't. Many style guides recommend no apostrophe in
"DDs". –  ShreevatsaR Feb 3 '11 at 16:35 check this link. I
think the question is duplicated. –  Manoochehr Feb 3 '11 at
16:51 @kiamlaluno: well then, how about this: What is the
correct way to pluralize an acronym? –  RegDwigнt Feb 3 '11 at
17:05 It's not really a duplicate. He isn't asking which usage
is correct, he's asking ho