- (signal) any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"
- (signal) notably out of the ordinary; "the year saw one signal triumph for the Labour party"
- (signal) sign: communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"
- (signal) any incitement to action; "he awaited the signal to start"; "the victory was a signal for wild celebration"
- (signal) bespeak: be a signal for or a symptom of; "These symptoms indicate a serious illness"; "Her behavior points to a severe neurosis"; "The economic indicators signal that the euro is undervalued"
- (signal) an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
- (Signal (band)) Signal (Сигнал) is a Bulgarian rock band, most popular in the 1970s and 80s.
- (Signal (Casiopea album)) Signal is the 37th studio album released by the jazz fusion group Casiopea in 2005.
- (Signal (computing)) A signal is a limited form of inter-process communication used in Unix, Unix-like, and other POSIX-compliant operating systems. Essentially it is an asynchronous notification sent to a process in order to notify it of an event that occurred. ...
- (Signal (contract bridge)) In the card game of contract bridge, the partners defending against a contract may choose particular cards to play to communicate a signal.
- (Signal (information theory)) In the fields of communications, signal processing, and in electrical engineering more generally, a signal is any time-varying or spatial-varying quantity.
- (Signal (KAT-TUN song)) "SIGNAL" is a song written by Ma-saya, Joker, Joey Carbone, Lisa Huang and Akira for the second single and second studio album of the Japanese boy band, KAT-TUN. ...
- (signal) An indication given to another person; An on-off light, semaphore, or other device used to give an indication to another person; An electrical or electromagnetic action, normally a voltage that is a function of time that conveys the information of the radio or TV program or of ...
- (Signal) Sound transmission; RF.
- (signal) A bolt out of the blue; that is, an event triggered by the operating system, probably when you're least expecting it.
- (signal) An intentional introduction of energy onto a communications path, resulting in the transmission of information. Contrast with noise.
- (Signal) An audio response or visual indication alerting the operator that a target has been detected.
- (Signal) A patch of contrasting color at the tip of the beard.
- (Signal) A spot pattern of a different color on the falls below the beard.
- (Signal) A beep sent from a Remote Signalling Device. "Default Signal" is used to refer to the default setting of the devices, which is Frequency 147.9, Code 30. Randomly signaling the default frequency/code is a good idea, and will cause nothing bad to happen ever.
- (Signal) To convey information through a firm's actions. The more costly it is to provide a signal, the more credibility it has. For example, to call a press conference and tell everyone that the firm's prospects have improved is less effective than saying the same thing and raising the dividend.
- (Signal) The absolute level of measurable quantity produced at the output terminals of the load cell.
- (Signal) Any electronic visual, audible, or other indication used to convey information. In semiconductors, an electrical quantity (typically voltage, current, or light level) corresponding to some physical quantity. Signals are coded in frequency or amplitude to separate them from unwanted noise.
- An audio signal is a representation of sound waves in a different form. In microphones, the acoustic signal is converted to an electrical voltage and then converted back to an acoustic signal through the loudspeaker.
- A signal is the transmission of an electrical current, through voltage or electromagnetic waves, as a means to convey data or sound.