7

This question already has an answer here:

How to write or tell that collection of Email ID's has been attached.

marked as duplicate by RegDwigнt Dec 5 '14 at 10:49

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  • It's ID's or IDs. AFAIK whether or not to use an apostrophe is solely a matter of preference. Both are valid. – J_LV Dec 5 '14 at 7:10
  • Yes, it can depend on the style guide you're using, but since you're clearly not using a style guide, the plural of cat is cats, and the plural of ID is IDs. Simple as that. There is no reason to even consider an apostrophe. It conveys no additional information that the simple -s does not. As to "how to tell", what do you mean? They sound completely identical in speech. Lastly, there is no reason to tag this "grammaticality". The question is entirely about orthography and has nothing to do with grammar. – RegDwigнt Dec 5 '14 at 10:56
7

It would be IDs. Were you to use the apostrophe (i.e, ID's), that would imply possession. If you're simply referring to a group of IDs, you drop the apostrophe.

4

As far as I know, there is no valid reason to put an apostrophe in IDs, as it is neither a possessive nor a contraction. It is simply a plural.

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