Signal

Signal, signals, signaling, or signalling may refer to:

Transportation (unidirectional)

Beacon
Distress signal
International maritime signal flags, using the International Code of Signals
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
Recognition signal in human, technical or biological communications
Unix signal, a form of interprocess communication
Signal (electronics), any time-varying or spatial-varying quantity
Signals (military), military communications
Signalling (telecommunications), a part of some communication protocols
Smoke signal
Telegraphic signal, in telegraphy

Signal, Wyoming
Signal (band), a Bulgarian rock band
Signals (Rush album), 1982
Signals (Mal Waldron album), 1971
Signal (album), a 2005 album by Casiopea
"Signal" (song), a 2006 song by KAT-TUN
Signal (1933), a New York Yiddish-language literary monthly published from 1933 to 1936 by the Communist Party USA
Signal (magazine), a Nazi propaganda magazine which was published in occupied Europe during World War II
Signal (toothpaste)
Signal 1 and Signal 2 radio stations
Signaal (now Thales Nederland), a Dutch defense company
SIGNAL (programming language), a synchronous programming language
Signal Systems, a telecommunications company of the McLean Group of Companies
Signal – The Southeast Electronic Music Festival, an annual music festival held in the United States
Signal (novel), a 2009 children's novel about a boy who helps a girl from another planet signal her parents
USS Signal, the name of more than one U.S. Navy ship
signal.h, a C standard library header declaring the signal function