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Signal

Signal, '''signals''', '''signaling''', or '''signalling''' may refer to:

In Transportation

- Traffic light
- Railway signal

In Communications, especially in Telecommunications

In communications, the '''''signal''''' can be either unidirectional (in simplex or broadcast systems), or duplex (with bidirectional communications between two users), or multiplex & duplex at the same time (with many users communicating over the same physical channel at the same time). In communications and telecommunications, the signal is the physical phenomenon that carries a message from one location to another. '''''Most commonly''''', a signal is in the form of sound sound wave|waves; in the form of an electricity|electric voltage or an electric current|current; or in the form of visible light, infrared, ultraviolet, or radio waves (all of which are forms of '''electromagnetic radiation'''; or in the form of olfactory|olfactory chemicals that are used by biological organismss.
- Telecommunications|Telecommunications signals
- International maritime signal flags, an antiquated way of sending messages by using hoisted flags (and the International Code of Signals)
- Maritime flag signalling|Maritime flag signaling, an antiquated way of sending messages, by using hoisted flags or similar means, by means of which ships could communicate with each other without using radio communications.
- Naval flag signalling|Naval flag signaling, an antiquated way of sending messages by using various kinds of shipborne flags, such as semaphore flags or hoisted flags, that was used between Naval and Coast Guard vessels without using radio communications
- A Recognition signal in human, technical, or biological communications
- The Semaphore, an antiquated way of sending visual messages
- Beacon|Beacons for communications, either by optical means or by radio
- Distress signals
- Signals (military), an antiquated term that refers to military communications
- Signaling (telecommunications), a part of some communications protocols
- Smoke signals, an antiquated way of sending messages
- Telegraphy|Signaling by means of the electrical telegraph, an antiquated electical way of sending messages

Names

- Signal (band), a Bulgarian rock band
- Signal (American band), an American AOR band
- Signals (album), an album by progressive rock band Rush
- Signal (magazine), a Nazi propaganda magazine that was published in occupied Europe during World War II
- The Signal (film)|''The Signal'', a 2007 horror film
- Signal (toothpaste)
- ''Signal 1'' and ''Signal 2'' radio stations
- ''Signaal'' (now Thales Nederland), a Dutch defence company
- Signal Systems, a telecommunications company of the McLean_Group_of_Companies#Signal_Systems|McLean Group of Companies
- Signal - The Southeast Electronic Music Festival, an annual music festival held in the United States
- ''Signal (novel)|Signal'', a children's novel about a boy who helps a girl from another planet signal her parents

Ships

- USS Signal|USS ''Signal'', the name of more than one United States Navy ship

Other

- Any implicit, subtle, or disguised message, in situations such as:
- Signaling_(economics)|Signaling in economic theory
- Partnership card games, see href="http://www.startlearningnow.com/Signal (bridge).htm">Signal (bridge)
- Signals in legal citation signals|legal citations
- Kent (game) a card game also known as Signal or Kemp
- In computing, a Signal (computing)|signals from one computer process to another one

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Sources: StartLearningNow, Wikipedia | Usage license: GNU FDL

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