A theoretical construct or device with known input and output characteristics but unknown method of operation.
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.
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.
The act, or process of setting something up, or establishing something; the composition or structure of such a thing; its makeup.
A legal document describing such a formal system.
The formal or informal system of primary principles and laws that regulates a government or other institutions.
A document issued by a religious authority serving to promulgate some particular church laws or doctrines.
A person's physical makeup or temperament, especially in respect of robustness.