ORIGINAL: misterpanda
And how about the use of the apostrophe ('), which denotes possesive, to indicate the PLURAL.
You see this continuously throughout these forums (fora).[:@]
You just reminded me of something that pushes my buttons. People write about "RPM's" all the time when it should just be RPM. It's never possessive and is already plural because it is an acronym for RevolutionS Per Minute. At least I can't think of a case where RPM would be possessive.