I can't find any source for this, but it seems more likely MM is an abbreviation of "mille mille." MM in Roman numerals would just be 2000. 1 million would be

I can't find any source for this, but it seems more likely MM is an abbreviation of "mille mille." MM in Roman numerals would just be 2000. 1 million would be written as M with a bar over it. [1] [1] http://en.wikipedia.org/wiki/Roman_numerals#Large_numbers http://en.wikipedia.org/wiki/Roman_numerals#Large_numbers