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VAMatt said:
Ka-pi96 said:
mm? Does that mean "million million"?

MM refers to a thousand thousand, as M is the Roman numeral for 1000.  MM was the standard way of indicating a million, as far as I knew, until the last decade or so.  I think most people just use a single M now.  I sometimes still use MM though.  

I've never seen MM over here in Europe. mm has always had a fixed meaning, millimeters or 1/100th of a meter.