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Comment by jonnathanson | Hacker News Reader

Technically speaking, the roman numeral "M" stands for one thousand. So "MM" = "thousand thousand," or million.

These days it's a matter of preference as to which abbreviation to use. You'll see different people and different firms using either/or. (And a lot of people are now using "k" for thousand and "M" for million.)

If we want to get even wonkier, we could note that the English word "million" derives from the French word "mille," meaning "thousand." ("Mille" derives from the Latin, and the original Latin denotation is used to mean "thousand" in familiar words like "millennium," "millisecond," and "millipede.") The word "million" was originally invented to mean "a great thousand," or "a thousand thousand."

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I thought MM would be 2000 if one used the Roman system. It's some sort of weird Roman system with maths in between the the Ms assuming I'm correct.

True. I'll confess that I'm not 100% sure how "MM" originally came to be used in financial and accounting notation. But it's been used to mean "million" by way of "thousand x thousand."

It's possible the M's in the financial notation system are not actually Roman numerals, so much as abbreviations of the word "mille" (or some equivalent thereof).

And a lot of people are now using "k" for thousand and "M" for million.

Those are the SI prefixes after all. :)

Postfix surely?

No, prefixes, as in kg. Money, as we have seen in this thread, does not use SI stuff at all, so talking about it this way is awkward, since $100k appears to have an SI "suffix" when technically it carries an SI "prefix." But US people usually do not say "100k USD"; they believe $ always means USD. People in other countries using $ know their dollar sign is likely to be confused, so are more likely to say "100T ZWD" etc.

Yeah, it's kilodollars, just written "$100k" rather than "100 k$" conventionally. But it's fairly clear that what's being multiplied is the base currency unit (dollars, euros, whatever). For historical reasons currencies give the units via a symbol before the number, instead of a letter after it: €10, $10, £10.

Depends on the country. Most people in the eurozone use "10 €", not "€10". However, when adding SI prefixes most people would append the prefix to the amount, rather than prepending it to the unit e.g. "100k €".

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