There are a variety of synonyms for the term "signal lights," which refer to lights used to communicate messages or information. One similar term is "traffic lights," which are commonly found on the streets and are used to control the flow of vehicles. Another synonym is "beacons," which are generally bright lights used to signal a location or to guide ships and other vessels. Flares, lanterns, and torches can also be considered synonyms of signal lights, as they are all used to emit light and convey messages or warnings. Ultimately, the term "signal lights" encompasses a broad range of lights used for communication and safety purposes.