An event or emanation to which a sensing device gives an undesired positive response.

A transmitter encodes data by producing a signal which is a continuous stream of signalling events each which has sufficient information for the receiver to recover the original data. Just like a quantum leap is the smallest measurable leap, a signalling event is the smallest possible amount of signal that the receiver needs to recover the original data without error.

A signal that only takes discrete values (contrasted to an analog signal that can take continuously varying values).

A signal that can vary in a continuous manner (as opposed to a digital signal that only takes discrete values).

(electrical engineering) The ratio comparing signal power to noise power. / (by extension) The quantity of quality information compared to irrelevant or incorrect information.

plural of signal phrase

An indication that something is a paraphrase or direct quote. / A phrase that signals a particular meaning or stance.

A gang sign.

a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day

A traffic light.