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signal aspect
(rail transport) The visual appearance of a railway signal
signal indication
The meaning of a railway signal
signal phrase
An indication that something is a paraphrase or direct quote. / A phrase that signals a particular meaning or stance.
gang signal
signal phrases
plural of signal phrase
hedgehog signalling pathway
(biochemistry, genetics) A key regulator of animal development present in many organisms from flies to humans.
signal-to-noise ratio
(sciences) A figure of merit comparing the strength of a signal carrying information to the noise interfering with it.
signal-to-noise ratios
right-away signal
(rail transport, UK) A signal given to a train driver by the guard of the train, or a member of station staff, that the train is ready to depart.
colour light signal
(rail transport, British spelling) An electric railway signal with colour aspects, showing either red or green in a 2-aspect signal, with the addition of a yellow or double yellow aspect (meaning caution) in 3- and 4-aspect signals.
