black box ( synonym found)
Definition of black box:

°Informal name for the brightly colored cockpit voice recorders and flight data recorders in an aircraft designed to aid in determining the cause of an accident.
°A theoretical construct or device with known input and output characteristics but unknown method of operation.
Definition of black box:

°Informal name for the brightly colored cockpit voice recorders and flight data recorders in an aircraft designed to aid in determining the cause of an accident.
°A theoretical construct or device with known input and output characteristics but unknown method of operation.
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