signal box signal board • signal fire · · · Info · Definitions · Synonyms · Characters · · signal box · · Text Common · · Latin · · Scripts 10 · · Length Definitions · · · (noun) a building from which signals are sent to control the movements of railway trains. Synonyms: signal tower. · · Noun Definition 1 Synonyms · · · signal · · Synonym 1 signaling · · Synonym 2 sign · · Synonym 3 signalize · · Synonym 4 signalise · · Synonym 5 bespeak · · Synonym 6 betoken · · Synonym 7 indicate · · Synonym 8 point · · Synonym 9 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 x latin small letter x U+0078