Signal (original) (raw)

A signal may be:

• An abstract element of information, or more exactly usually a flow of information (in either one or several dimensions). See Signal (information theory)
• In computing, an asynchronous event transmitted between one process and another (in Linux, UNIX and other POSIX-compliant operating systems, and also in several real-time operating system).
• A means of controlling road vehicles, pedestrians or trains. See Traffic signal, Pedestrian crossing or Railway signal.

See also

• Signal processing, noise (physics).

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