black box

The term black box typically refers to a system, object, or device which can be viewed in terms of its inputs and outputs without any knowledge of its internal workings. In aviation, it specifically refers to a flight recorder (which is historically painted bright orange for visibility). The phrase originated in the mid-20th century, likely from World War II Royal Air Force slang describing radar and navigational instruments housed in non-reflective black casings, before being adopted into cybernetics and software engineering contexts.

While widely used in technical fields to describe complex algorithms—particularly in artificial intelligence—the term has faced scrutiny alongside other color-based metaphors. Proponents of inclusive language sometimes argue that relying on "black" to represent concepts of darkness, hiddenness, or negativity can reinforce unconscious racial biases. However, many linguists and engineers distinguish "black box" from terms like "blacklist," noting that "black" here refers literally to opacity (the absence of light) rather than a moral judgment of "badness," making it acceptable to many who otherwise support removing racialized metaphors from technical vocabulary. Others prefer alternative terms simply for the sake of technical precision.

Example:
"The neural network operates as a black box, making it difficult for developers to explain exactly how it arrived at its specific conclusion."

Example:
"After the incident, investigators recovered the black box to analyze the flight data."