An electromechanical or electronic bell, klaxon, chime, horn, speaker, strobe light or other device which warns people in a building of a possible fire or other condition requiring evacuation.
The sound or other warning made by a fire alarm.
An emergency response to a fire by the fire department with manpower and equipment.
An on-off light, semaphore, or other device used to give an indication to another person.
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.
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.
To communicate with (a person or system) by a signal.
To indicate; to convey or communicate by a signal.
Standing above others in rank, importance, or achievement.