Editing Signal (disambiguation) (section)

==Science and technology==
* [[Analog signal]]
* [[Audio signal]]
* [[Digital signal]]
** [[Digital signal (signal processing)]]
* [[Cell signaling]], in biology
* [[Signalling (economics)]], in economics theory
* [[Signal processing]], subfield of electrical engineering
* [[Signalling theory]], in evolutionary biology
* [[Time signal]]

===Computing===
* [[SIGNAL (programming language)]], a synchronous programming language
* [[Signal (IPC)]], a form of inter-process communication used in Unix and related operating systems
** [[C signal handling]], a way for handling signals received by programs during their execution
* A term in [[functional reactive programming]]

===Communications===
* [[Military communications]], often called "signals"
** [[Signal corps]], military branch responsible for military communications
* [[Recognition signal]] in human, technical or biological communications
* [[Signal (software)]], an end-to-end encrypted messaging application
** [[Signal Protocol]], a cryptographic protocol used by the Signal application
* [[Signaling protocol]] to establish or tear down a connection, and to identify the state of the connection
* [[Signaling (telecommunications)]], a part of some communication protocols
* [[Smoke signal]], an ancient form of communication
* [[Telegraphic signal]], in telegraphy

====Communication for transport====
* [[International Code of Signals]], a standard for sending signals by displaying flags
** [[Maritime flag signalling]], generally flaghoist signalling, by which ships communicate with each other
** [[Naval flag signalling]], covers various forms of flag signalling, such as semaphore or flaghoist
* [[Railway signal]]
* [[Traffic light]] (traffic signal)