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Although this practice is rare in 20c standard usage, the apostrophe of plurality continues in at least five areas: (1) With abbreviations such as V.I.P.'s or VIP's, although forms such as VIPs are now widespread. (2) With letters of the alphabet, as in His i's are just like his a's and Dot your i's and cross your t's. In the phrase do's and don'ts, the apostrophe of plurality occurs in the first word but not the second, which has the apostrophe of omission: by and large, the use of two apostrophes close together (as in don't's) is avoided. (3) In decade dates, such as the 1980's, although such apostrophe-free forms as the 1980s are widespread, as are such truncations as the '80s, the form the '80's being unlikely. (4) In family names, especially if they end in -s, as in keeping up with the Jones's, as opposed to the Joneses, a form that is also common. (5) In the non-standard (‘illiterate’) use often called in BrE the greengrocer's apostrophe, as in apple's 55p per 1b and We sell the original shepherds pie's (notice in a shop window, Canterbury, England).

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The apostrophe is sometimes used with -s to form the plural of letters, numerals, abbreviations, symbols and words used as words.

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Without the apostrophe the meaning is completely changed.

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I would only use the apostrophe in plurals when its omission might cause confusion.

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Sure enough, he happened upon it as he was in my office and it was on my desk. He wasn't amused. Roll Eyes

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Originally posted by Kalleh:
Hey, guess how many times we have mentioned the word apostrophe on this site? 553! Aren't we anal?

Anyhow, I thought this was funny.