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mm is milimeters. MM does not exist.

MM = 1,000 * 1,000 == 1,000,000 <- thats where MM comes from Roman numerals.

jeasus christ:

https://corporatefinanceinstitute.com/resources/fixed-income...

Seems like you engineers have been behind code and not having to defend your project budgets to CFOs and stakeholders often.

MM is 2,000 in Roman numeral notation, not a million.

Yeah, but finance people (way after the roman times) adopted M as a suffix for thousands, and once you treat it as a suffix or prefix it made sense (to them) to use MM for million. You sometimes see the same done in engineering-adjacent contexts with SI prefixes, like using kk for million.

The finance people that I know uses K for thousands and MM for million.

Tech and science use K for thousand and M for million.

Using K and MM in finance reduces the odds of an incorrect interpretation of a single M.

Sweden faint memory of using ' and " for accounting. 1' is 1 000, 1" is 1 000 000. Or something like that, didn't spend much time on it.

So MMXXIV = 1,000 * 1,000 * 10 * 10 * 1 * 4?

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