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Plural Form

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Acronyms should be pluralized by adding an s to the end. Those that end with S should instead be pluralized with an es. Do not use an apostrophe before the s or es.
Abbreviations often follow the same plural rules as acronyms. However, note that some abbreviations, particularly SI units, may not be pluralized with an s. When in doubt, Google is your friend.

Examples

Correct
Incorrect
UFOs
UFO's
WMDs
WMD's
TARDISes
TARDISs
10°C
10°Cs