The correct terminology is Bf.
Messerchmitt designed aircraft for the company called Bayerische Flugzeugwerke (Bf), - my German is nicht ser gut but I think Bavarian Aircraft Factory would be a close translation.
I too remember the 109 being called Me109 but I think that was the popular press. Certainly all the specialist publications I have from the fifties on refer to the aircraft by its correct title.
Regards Dave
Long haired yobs fighting and marching. Should put them in the army, that would soon stop them fighting and marching,