Umber-crunching: N. Computations Of A Numerical Nature, Esp.

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:number-crunching: n. Computations of a numerical nature, esp.
those that make extensive use of floating-point numbers. The only
thing {Fortrash} is good for. This term is in widespread
informal use outside hackerdom and even in mainstream slang, but
has additional hackish connotations: namely, that the computations
are mindless and involve massive use of {brute force}. This is
not always {evil}, esp. if it involves ray tracing or fractals
or some other use that makes {pretty pictures}, esp. if such
pictures can be used as {wallpaper}. See also {crunch}.
-- The AI Hackers Dictionary