Digitizer

OPTICAL DIGITIZER
Any device using a photo sensor that can convert analog information to digital code
ORD
Operational Requirements Document ...

Digitizer - Any electronic device capable of converting information to a digital format; usually refers to encoding devices that convert sensed altitude into a transponder code.
DME - Distance Measuring Equipment.
DP - Deal Pending.

See also: Aviation, Flight, Power, Runway, Air traffic