black box
noun
RareNot in standard dictionaries
1
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.
2
Any similar device on motor vehicles, such as rail event recorders and ship trip recorders.
3
A theoretical construct or device with known input and output characteristics but unknown method of operation.
4
A device used in phreaking that prevents the calling party from being billed for the call placed.
5
A type of theater characterized by a lack of decoration or complex mechanisms.
6
Synonym of football (“the leather briefcase containing classified nuclear war plans which is always near the US President”)
Thesaurus
#informal