Useful information, as opposed to noise.
A signal transmits information from one entity to another entity. A morphism is a signal. A signal is an entity.
Cultural Definition
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 electrical or 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. "My mobile phone can't get a signal in the railway station."
A token; an indication; a foreshadowing; a sign.
Useful information, as opposed to noise.
(computing, Unix) A simple interprocess communication used to notify a process or thread of an occurrence.
Signal (electrical engineering) (Wikipedia)
a function that conveys information about the behavior or attributes of some phenomenon
how quickly a message can be communicated (using any particular method) between two separated parties
a complex system of communication that governs basic cellular activities and coordinates cell actions. The ability of cells to perceive and correctly respond to their microenvironment is the basis of development, tissue repair, and immunity as well as normal tissue homeostasis. Errors in cellular information processing are responsible for diseases such as cancer, autoimmunity, and diabetes.
a body of theoretical work examining communication between individuals. The central question is when organisms with conflicting interests should be expected to communicate honestly (no presumption being made of conscious intention) rather than cheating.
a limited form of inter-process communication used in Unix, Unix-like, and other POSIX-compliant operating systems. A signal is an asynchronous notification sent to a process or to a specific thread within the same process in order to notify it of an event that occurred.
Pattern Expression
All Entities in Existence send & receive signals.