- any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"
- notably out of the ordinary; "the year saw one signal triumph for the Labour party"
- 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"
- any incitement to action; "he awaited the signal to start"; "the victory was a signal for wild celebration"
- 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"
- an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
- Signal (Сигнал) is a Bulgarian rock band, most popular in the 1970s and 80s.
- In the card game of contract bridge, the partners defending against a contract may choose particular cards to play to communicate a signal.
- Signal is the 37th studio album released by the jazz fusion group Casiopea in 2005.
- 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. ...
- In the fields of communications, signal processing, and in electrical engineering more generally, a signal is any time-varying or spatial-varying quantity.
- "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. ...
- 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 communication ...
- (Signals) Internal and external factors that control changes in cell structure and function.
- (Signals) Conventional card plays made by the defenders to give each other information.
- (Signals) The use of syndication technology such as RSS to notify users of content changes.
- (Signals) are the baby's way of informing a caregiver of an elimination need. Some babies signal very clearly from the beginning, while others may have very subtle signals or not signal at all. ...
- (Signals) on the player's track
- (Signals) or Signalling: An aid (visual, verbal or tactile) to let the lady know what move is coming up next. ...
- (signals) (in materials science: Materials for computers and communications)
- (signals) Any form of clandestine tradecraft using a system of marks, signs, or codes for signaling between operatives.
- Each referee signals whether a lift has been successful or not by a light that signals their ruling. Red Light indicates the lift was not successful and a white light that it was successful.
- The form of variation with time of a wave whereby information is conveyed in some form whether it is acoustic or electronic.
- Software interrupts sent to a program to indicate that an important event has occurred. The events can vary from user requests to illegal memory access errors. ...
- A bolt out of the blue; that is, an event triggered by the operating system, probably when you're least expecting it.