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No, not as a rule. Abreviations just end with a period; like California is just Ca. Education is Ed. * It is becoming acceptable to pluralize abbreviations and acronyms where it increases ease of reading. Technically it's in a bit of a grey area because an abbreviation is a form of contraction. If you think it helps clarity to put an apostrophe - s on the end of an acronym or abbreviation then go ahead. CPUs or CPU's, you decide. Sometimes they just look plain wrong either way

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16y ago

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