A flight recorder; the brightly colored cockpit voice recorders and flight data recorders in an aircraft designed to aid in determining the cause of an accident.
A device used in phreaking that prevents the calling party from being billed for the call placed.
A type of theater characterized by a lack of decoration or complex mechanisms.
A theoretical construct or device with known input and output characteristics but unknown method of operation.
Any similar device on motor vehicles, such as rail event recorders and ship trip recorders.
To focus on the inputs and outputs without worrying about the internal complexity.
A device which records data that would be of use in investigating the cause of an aircraft accident; usually in pairs, consisting of a flight data recorder and a cockpit voice recorder.