A three-pointed "Nein" is what Mercedes has responded to BMW's offers of courtship. The folks from the roundel had suggested that the two companies combine some of their efforts in order to build the best cars. BMW hadn't specified what kind of tie-in that would mean, but they were serious enough about it to go public with it. Mercedes and BMW currently work together on hybrid engines, but that, frankly, is as far as Mercedes wants to go. It's entirely possible that, having just gotten out of one relationship, Mercedes isn't anxious to do it again so soon, no matter how good looking the potential match is.
[Source: Motor Authority]