signal
Signal, signals, signaling, or signalling may refer to:
Scientific concepts
 Signal (electrical engineering), a physical quantity that can carry information.
Signal processing, the field of techniques used to extract information from signals
Cell signaling, in biology, the system of communication that governs basic cellular activities and coordinates cell actions
Signal (biology), an electrochemical communication activity in an organism
Two theories in different disciplines of "honest signalling" when deception may be incentivized:
* Signalling theory in evolutionary biology, a theory stating how organisms signal their state to others with respect to evolutionary survival and reproductive fitness
* Signalling (economics), how market actors can signal their intentions and values to others in economics
Signalling game, signalling theories in evolutionary biology and economics expressed in terms of game theory
Computing:
Signal (computing), an event, message, or data structure transmitted between computational processes
Signal programming, a variety of event-driven programming
Signals and slots, a signal-driven software design pattern
Communications
Signals used in various kinds of transport:
* Traffic light
* Railway signal
* Semaphore
* Beacon
* International maritime signal flags, using the International Code of Signals
Signals (military), a name that refers to military communications
Distress signal
Smoke signal (See also )
Signalling (telecommunications), a part of some communication protocols
Names
Signal (band), a Bulgarian rock band
Signals (album), an album by progressive rock band Rush
Signal (magazine)
Signal (toothpaste)
Signal 1 and Signal 2 radio stations
Signaal (now Thales Nederland), a Netherlands based defence company
Signal Systems, a company of the McLean Group of Companies
Other
Any implicit, subtle, or disguised message, in situations such as:
* Partnership card games (see Signal (bridge))
Signals in legal citations
Kent (game) a card game also known as Signal or Kemp
See also
The Signal
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