Foom, or "AI foom", is a informal but popular shorthand term for a hard AI takeoff -- or, as rationalwiki puts it, it is short for a "recursively self-improving Artificial Intelligence engendered singularity". It is generally viewed as a extremely dangerous thing, and the term most likely comes from an onomatopoeia of a mushroom cloud.

Originally foom was written in all caps, but that was dropped fairly quickly once it came into common usage in futurism circles. Foom is most often a noun, although it may be used as a verb.

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