signal

Definitions

• A sequence of states representing an encoded message in a communication channel.
• Any variation of a quantity or change in an entity over time that conveys information upon detection.
• A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.
• An on-off light, semaphore, or other device used to give an indication to another person.
• (of a radio, TV, telephone, internet, etc.) An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.
• An action, change or process done to convey information and thus reduce uncertainty.
• A token; an indication; a foreshadowing; a sign.
• Useful information, as opposed to noise.
• (computing) A simple interprocess communication used to notify a process or thread of an occurrence.
• (biochemistry) A signalling interaction between cells