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.
Something actual as opposed to invented.
An individual value or measurement at the lowest level of granularity in a data warehouse.
An objective consensus on a fundamental reality that has been agreed upon by a substantial number of experts.
Something which is real.
A wrongful or criminal deed.
Something concrete used as a basis for further interpretation.
Information about a particular subject, especially actual conditions and/or circumstances.
Used before making a statement to introduce it as a trustworthy one.