FMA may be an acronym for Full Metal Alchemist which is a popular anime series . ~It may also be Force times Mass over Area. Because the Category you have your question in is "Isaac Newton".
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...