signal head meaning in English

号志组合
信号器

Traffic control equipment - signal heads ; german version en 12368 : 2006
交通控制设备.信号器
Traffic control equipment - signal heads
交通控制设备.信号灯头
Traffic control equipment - signal heads
交通控制设备.信号器
Road traffic signal systems - part 300 : technical requirements for signal heads with led
道路交通信号系统.第300部分:带led的信号器的技术要