con·trol·ler 
/kənˈtroʊlɚ/ noun
plural con·trol·lers /kənˈtroʊlɚ/ noun [count] 1 : a person who is in charge of the money received and paid out by a business or college 2 : a person who directs the action of something
▪ an air traffic controller 3 : a device or piece of equipment used to operate a machine, vehicle, or system
▪ a volume controller
▪ an air traffic controller
▪ a volume controller
