AATD Advanced Aviation Training Device, an FAA classification for flight simulators certified as complete products, as opposed to as built and installed. It is a higher fidelity simulator than the BATD
BATD Basic Aviation Training Device, an FAA classification for flight simulators certified as complete products, as opposed to as built and installed. This is the entry level certification for this kind of product.
FAA The United State's Federal Aviation Administration, the Civil Aviation Authority responsible for certifying flight simulators and regulating aviation in general
EASA European Aviation Safety Agency, the EU agency responsible for the certification of flight simulators in the European Union, and regulating aviation
ICAO The International Civil Aviation Organization is an agency of the United Nations which operates in an unique international role, for the purposes of simulation they write specifications which are then used to inform Civil Aviation Authorities and may be adopted directly by them
CAA Civil Aviation Authority, a generic reference to the national aviation regulator in the country
NAA See CAA
Visual The complete system which provides the visual feedback of the flight simulator. Generally this is is only a reference to the out the window visual.
OTW Out The Window the view of the virtual world which can be seen from inside the cockpit.