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.

An American crayfish, Pacifastacus leniusculus, having a large claw that it waves to attract a mate.

plural of smoke-signal

plural of smoke signal

Alternative spelling of smoke signal

(often pluralized) A method of long-distance communication sometimes used in ancient and undeveloped societies, consisting of messages conveyed by means of columns or intermittent puffs of smoke.

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

An unclear message, often contradicting a situation.