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Grey goo is to a hypothetical end-of-the-world scenario involving molecular nanotechnology in which out-of-control self-replicating robots consume all living matter on Earth while building more of themselves (a scenario known as ecophagy).[6]
Brown, when used as a general term, is a color that is a dark yellow, orange, or red, of low luminance relative to lighter or white colored objects.[1]
As a color of low intensity it is a tertiary color in the original technical sense: a mix of the three subtractive primary colors is brown if the cyan content is low.
Brown exists as a color perception only in the presence of a brighter color contrast: yellow, orange, red, or rose objects are still perceived as such if the general illumination level is low, despite reflecting the same amount of red or orange light as a brown object would in normal lighting conditions.