signal-to-noise ratio: [from analog electronics] n. Used by
hackers in a generalization of its technical meaning. `Signal'
refers to useful information conveyed by some communications medium,
and `noise' to anything else on that medium. Hence a low ratio
implies that it is not worth paying attention to the medium in
question. Figures for such metaphorical ratios are never given.
The term is most often applied to Usenet newsgroups during flame
wars. Compare bandwidth. See also coefficient of X, lost in
the noise.
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