A signal is any variation of a medium that conveys information.
Signal or signaling may also refer to:
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 Signals and slots, a form of communication among objects in the Qt environment 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)
Arts and entertainment
Books and magazines Signal (magazine), a Wehrmacht propaganda magazine which was published in occupied Europe during World War II SIGNAL (US magazine), publication of the Armed Forces Communications and Electronics Association Signal, a New York Yiddish-language literary monthly published from 1933 to 1936 by the Communist Party USA Signal (novel), a 2009 children's novel about a boy who helps a girl from another planet signal her parents
TV and movies Signal (South Korean TV series), a 2016 South Korean police procedural TV series Signal (Japanese TV series), a 2018 Japanese police procedural TV series based on the 2016 South Korean series of the same name Signal, Wyoming, a fictional town from the 2005 film Brokeback Mountain "Signals", a 2005 episode of the animated television series 12 oz. Mouse
Music Signal (band), a Bulgarian rock band Signal – The Southeast Electronic Music Festival, an annual music festival held in the US
Albums Signal, a 2005 album by Casiopea Signals (Mal Waldron album), 1971 Signals (Mallory Knox album), the début album of the Mallory Knox band Signals (Rush album), 1982 Signals (Wayne Krantz album), 1990 Signals, an album by American band Devour the Day Signal (EP), a 2017 extended play by South Korean girl group Twice Signals (Bini EP), 2026 Signals (Madeline Kenney EP), 2016
Songs "Signal" (KAT-TUN song), a 2006 song by KAT-TUN "Signal" (Twice song), a 2017 song by Twice "Signals" (song), a 2021 song by Regard and Kwabs "Signal", a song by General Degree "Signal", a single by Stan Getz "Signal", a song from the 2006 Bollywood film Bhagam Bhag "Signal", a song by Sara Groves from the album Floodplain
Places United States Signal, Arizona, a ghost town Signal, Missouri, a ghost town Signal, Ohio, an unincorporated community
Organizations Signal Foundation, a non-profit organization Signal Entertainment Group, a South Korean company
Other uses Signal (bridge), a permitted means of conveying information to partner through the play of cards in contract bridge Citation signal, in law Signal (toothpaste) USS Signal, several US Navy ships Signals (Finnish Defence Forces), a service branch
See also Cignal, a satellite pay TV provider in the Philippines Cignal TV, Philippine media and telecommunications company Cygnal, an audio and video server Digital signal (disambiguation) Signaal, former name of the Dutch defense company Thales Nederland Signal Awards, awards for podcasts Signal 1, a radio station Signal 2, a radio station The Signal (disambiguation) Singal, a surname Signal Mountain (disambiguation) Virtue signalling, the conspicuous expression of moral values