TSA - Transportation Safety Administration; The government agency that scans passengers
Arrivals - the level of the airport where arriving passengers are reunited with their luggage and family.
It has been called Baggage Claim in the past.
This is level 1.
Departures - the level of the airport where passengers check in, drop their luggage, and enter the secure area of the through a TSA security checkpoint.
It has been called Ticketing in the past.
This is level 2.
MUFIDS - the arrival/departure screens (multi-user flight information display system)