Incapable of being canceled, lost, or forgotten.
Having the quality of being difficult to delete, remove, wash away, blot out, or efface.
Incapable of being annulled.
To communicate with (a person or system) by a signal.
To indicate; to convey or communicate by a signal.
A token; an indication; a foreshadowing; a sign.
A signalling interaction between cells
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.
Any variation of a quantity or change in an entity over time that conveys information upon detection.
An on-off light, semaphore, or other device used to give an indication to another person.
A simple interprocess communication used to notify a process or thread of an occurrence.
Useful information, as opposed to noise.
An action, change or process done to convey information and thus reduce uncertainty.
A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.
A sequence of states representing an encoded message in a communication channel.
Standing above others in rank, importance, or achievement.