Definition
FINAL MONITOR CONTROLLER
Air Traffic Control Specialist assigned to radar monitor the flight path of aircraft during simultaneous parallel (approach courses spaced less than 9000 feet/9200 feet above 5000 feet) and simultaneous close parallel approach operations. Each runway is assigned a final monitor controller during simultaneous parallel and simultaneous close parallel ILS approaches.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).