<communications> 1. Spurious characters due to electrical <a href="">noisea> in a communications link, especially an <a href="">EIA-232a> serial connection. Line noise may be induced by poor connections, interference or <a href="">crosstalka> from other circuits, electrical storms, <a href="">cosmic raysa>, or (notionally) birds crapping on the phone wires. 2. Any chunk of data in a file or elsewhere that looks like the results of electrical line noise. 3. Text that is theoretically a readable text or program source but employs <a href="">syntaxa> so bizarre that it looks like line noise. Yes, there are languages this ugly. The canonical example is <a href="">TECOa>, whose input syntax is often said to be indistinguishable from line noise. Other non-<a href="">WYSIWYGa> editors, such as <a href="">Multicsa> "<a href="">qeda>" and <a href="">Unixa> "<a href="">eda>", in the hands of a real hacker, also qualify easily, as do deliberately <a href="">obfuscatea>d languages such as <a href="">INTERCALa>. [<a href="">Jargon Filea>] (1994-12-22)

In science, Brownian noise, also known as Brown noise or red noise, is the type of signal noise produced by Brownian motion, hence its alternative name of random walk noise. The term "Brown noise" does not come from the color, but after Robert Brown, who documented the erratic motion for multiple types of inanimate particles in water.

In electronics, noise is an unwanted disturbance in an electrical signal. Noise generated by electronic devices varies greatly as it is produced by several different effects.