Fibrocyte wrote on Feb 6, 2013, 05:23:

Quboid wrote on Feb 5, 2013, 23:38:
Does anyone else find the MM notation bizarre? Maybe it's a British thing (not that I'm the only Brit here) but that looks like millimetres to me. I know it meant million way back but I think the only people to use it now, aside from Blue, are people working in print media and that's hardly applicable here.

They're just taking the word "Million" and then removing all of the letters except for the M's.