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Millions is usually abbreviated to MM for this reason.

So millimeters, then? :)

"M" is used quite frequently for million along with "K" for thousand. "MM" as million is used in conjunction with "M" for thousand, but that's a different notation set. "M" & "K" usage is generally much more popular than "MM" and "M", at least in any areas I've been.

> So millimeters, then? :)

The difference between mm and MM is rather easy to spot.

No, MM is an abject abuse of Roman numerals (which means 2,000), as near as I can tell thanks to a nomenclature distortion originally involving CPM (cost per thousand impressions). I can't get over how messed up MM=million is.

"mm" is frequently used in finance and probably predates the existence of CPM

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