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by codeka 4972 days ago
OK, so after a bit of searching, it seems that it comes from the Latin word for "thousand", millia[1]. And it's apparently common in financial contexts.

So 1M is 1,000. 1MM is 1,000,000. 1MMM is 1,000,000,000 (though the former and latter are not as common). Still seems like a confusing way to abbreviate to me.

[1]: http://en.wikipedia.org/wiki/Mile