beacon
/ˈbi:kən; `bikən/ n
1 fire lit on a hilltop as a signal 烽火.
2
(a) light fixed on rocks or on the coast to warn or guide ships, or on a mountain, tall building, etc to warn aircraft 灯塔; 灯标.
(b) flashing light on an airfield for the guidance of pilots （飞机场上指示飞机起降的）闪光灯.
3 signal station such as a lighthouse （灯塔之类的）信号站.
4 radio station or transmitter whose signal helps ships and aircraft to discover their position （帮助航船和飞行器确定位置的）无线电台或发射台.
5 (Brit) = Belisha beacon.