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.
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