They were named after the company founders Forrest Mars Sr. and R. Bruce Murrie
No they used to be called S & S :)
The M's are the last names of two men. The first man is Forrest E. Mars, Sr., founder of the Mars Company. The other M stands for Murrie, as in Bruce Murrie, son of long-term Hershey president...
It was for the founders, Mars & Murrie.
after the candies cool they are put on a conveyor belt and are stamped by a machine