(mathematics) A digit that is meaningful with respect to the precision of a measurement: in other words a digit that is non-zero, followed by a non-zero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.

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

simple past tense and past participle of signal boost

present participle of signal boost

plural of signal boost

Third-person singular simple present indicative form of signal boost