BMW M1, M3, M5.. The M means??? - BaseRSXmanual
I read that M1 stands for "mid-engine car, first type". But that was BMW's only mid-engine production car. Now they say the M in M3 and M5 stands for "motorsport". What is the deal? Did they just change what it means after the M1 because they didn't want to make anymore mid-engine cars?
BMW M1, M3, M5.. The M means??? - Cyrill666 {P}
Mental, Menace or Madness perhaps? How about Manhood? However, I think Muppet about sums it up - well it does round here anyway!

Cheers,
Cyrill666