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In the context of advertising, I read "57M" as $57,000. They would normally write 57MM if they meant $57 million, wouldn't they?

> In the context of advertising, I read "57M" as $57,000.

?? I would expect to see $57,000 abbreviated as $57K.

That's now how they roll in that business. CPM for instance = cost per thousand.

Maybe they all studied Latin or learned Roman numerals?

Yep, the 'M' means 'mille' as I understand it. 'MM' is 'mille mille', or 'thousand thousand.'

Do you mean like the Roman "M" for thousand and "MM" for million? That is mixing Arabic numerals with Roman numerals.