M or M
While M, indeed, stands for a thousand and an M with a line over the top (unable to type this here) stands for a million, it seems like the conventional way to describe these figures is now "K" for a thousand and "M" for a million. This is a mixture of the Metric system and Roman numerals, but since there were no typewriters that could put a bar over the top of the M I suppose this could be the origin.
|