beacon

noun

• a fire or light set up in a high or prominent position as a warning, signal, or celebration: a chain of beacons carried the news her red hair was like a beacon in the night figurativethe prospect of a new government was a beacon of hope for millions
• [often in place names] British a hill suitable for a beacon:Ivinghoe Beacon
• a light or other visible object serving as a signal, warning, or guide at sea, on an airfield, etc..
• a radio transmitter whose signal helps to fix the position of a ship, aircraft, or spacecraft.