Signal

A signal may refer to:

an abstract element of information, or, more exactly, usually a flow of information (in either one or several dimensions). See Signal (information theory).
(in electronics) a signal is any physical phenomenon that can be modeled as a function from time or position. Signals carry information: Analog signals are continuous while digital signals are discrete (see signal processing and noise (physics)).
a signal in computing.
(in the streets) a means of controlling road vehicles, pedestrians or trains (see Traffic signal, Pedestrian crossing or Railway signal).
(in a partnership card game) a player's choice of card to play at a particular time, which gives information to a partner, in a partnership card game (see signal (bridge)).
Signal was also a German Wehrmacht propaganda newspaper during World War II.
In economics, a signal describe a way of credibly conveying information from one party to another. See signaling, Michael Spence.

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