It is also used as the name of 'the interface device unit' used to access the flight management computers (FMC), the main computers and software seen in larger aircraft, especially airliners such as Boeing 737, 767, and 777.
1 is the interface device unit used to access the Flight Management Computers (FMC), the main computers and software of larger aircraft. CDUs are mostly seen on airliners, like the Boeing 777.
The Control Display Unit (CDU) ↩