Signal

Signal, signals or signalling may refer to:

 Scientific concepts 
 Signal (electrical engineering), a varying quantity that can carry information over air or wires.
 Signal processing, the field of techniques used to extract information from signals
 Signal (computing), an event, message, or data structure transmitted between computational processes
 Cell signalling (biology), the system of communication that governs basic cellular activities and coordinates cell actions
 Signal (biology), electrochemical activity in an organism

 Communications 
 Signals used in various kinds of transport:
 Road traffic signal
 Railway signal
 Semaphore
 Beacon
 International maritime signal flags, using the International Code of Signals
 Signals (military), a historical name for the military communications
 Signal corps, the branch of military which operates with command, control and communications systems
 Signalling theory in biology, how organisms signal their state to others
 Distress signal
 Smoke signal (See also :Category:Early telecommunications)
 Signalling (telecommunications), a part of some communication protocols
 Signal (recognition), a way of showing that a person recognizes something; such as the Color of the day used by police.

 Names 
 Signal band A rock band from Northwest Indiana
 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
 Signal (subscription service), service that provided real-time stock quotes
 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))
 Signaling (economics)
 Signals and slots, a software design pattern
 Kent (game) a card game also known as Signal or Kemp

Category:Engineering concepts