M, yes. Not come across MM. Except that Classicist tend to double the abbreviation letter for plural eg p for page and pp for pages.
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One million mm.
"M" = thousand (from Roman numerals) "MM" = thousand thousand = million
Mega means million or 106 so one Mm is 1000000 m .
To convert from mm to km, divide by a million. (1 km = 1000 m; 1 mm = 0.001 m.)
M = a thousand dollars MM = a million dollars (a thousand thousands)