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including an ASCII logo or one's choice of witty sayings (see sig quote, fool file, the); but many consider large sigs a waste of bandwidth, and it has been observed that the size of one's sig block is usually inversely proportional to one's longevity and level of prestige on the net. See also doubled sig.
sig quote /sig kwoht/ n. [Usenet] A maxim, quote, proverb, joke, or slogan embedded in one's sig block and intended to convey something of one's philosophical stance, pet peeves, or sense of humor. "Calm down, it's only ones and zeroes."
sig virus n. A parasitic meme embedded in a sig block. There was a meme plague or fad for these on Usenet in late 1991. Most were equivalents of "I am a .sig virus. Please reproduce me in your .sig block.". Of course, the .sig virus's memetic hook is the giggle value of going along with the gag; this, however, was a self-limiting phenomenon as more and more people picked up on the idea. There were creative variants on it; some people stuck 'sig virus antibody' texts in their sigs, and there was at least one instance of a sig virus eater.
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.
silicon n. Hardware, esp. ICs or microprocessor-based computer systems (compare iron). Contrasted with software. See also sandbender.
silly walk vi. [from Monty Python's Flying Circus] 1. A ridiculous procedure required to accomplish a task. Like grovel, but more random and humorous. "I had to silly-walk through half the /usr directories to find the maps file." 2. Syn. fandango on core.
silo n. The FIFO input-character buffer in an RS-232 line card. So called from DEC terminology used on DH and DZ line cards for the VAX and PDP-11, presumably because it was a storage space for fungible stuff that went in at the top and came out at the bottom.

 
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