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.
A small device or gadget, the correct term for which is forgotten or unknown.
Anything that can be thrown or swung with force against something else.
An architectural style of apartment building, where the second storey overhangs an area for parking cars.
A special ornamental typographical symbol, such as a bullet, an arrow, a pointing hand etc.
A kind of word puzzle involving pictures or typography that hint at the solution.
A silly, crazy or stupid person.