And BMW is, for the most part, encoding more into their designations. They split the 3 series into the 3 series coupes and 4 series sedans (ignore the GCs, as beautiful as they are) and for the most part the even numbers are supposed to be the coupier cars compared to the odds (see X6 vs X5).

Owning an M4 I didn't realize how often I'd have to explain this to random folks at the gas station when they wondered what the hell an M4 is when they've only seen M3s.