Alternative spelling of danger signal.

plural of signalling pathway

plural of signal cabin

Any signal sent by semaphore.

(rail transport) Synonym of signal box

(rail transport, US) A structure built over railroad tracks on which signals are mounted. / (nautical) An open platform by the navigating bridge of a warship for the use of signalmen.

plural of signal bridge

(rail transport, British spelling) A rail safety system installed in the driving cab of a train, which gives information to the train driver on track status and condition.

simple past tense and past participle of signal boost

present participle of signal boost