![range light range light](https://www.tekportal.net/wp-content/uploads/2018/11/range-light.jpg)
noun nautical
- one of a pattern of navigation lights, usually fixed ashore, used by vessels for manoeuvring in narrow channels at night
- one of a distinctive pattern of lights shown at night on the masts of a powered vessel, such as a tugboat, to aid in identifying its size, number of barges in tow, etc