Black box - (science, computing, engineering) a device, system or object viewed only in terms of inputs and outputs (or transfer characteristics), "opaque" (black) non-transparent faith-based implementation, without knowledge of its internal workings. by JasonCarswell in OpenScience_Scientism

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The opposite is a transparent open system with inner components or logic are available for inspection, which is most commonly referred to as a white box (sometimes also known as a "clear box" or a "glass box").