switch signal
/ˈswɪtʃ ˈsɪɡnəl/
n
English · switch signal中文 · 道岔标志器Español · señal de posición de la agujaFrançais · signal de position d’aiguille
意味：Device with an arm that is controlled by the switch stand; it is raised or lowered to indicate whether the switch is open or closed.