Algotbeacon
/ˈbiːk(ə)n/
noun
1 A fire or light set up in a high or prominent position as a warning, signal, or celebration.
1.2 A light or other visible object serving as a signal, warning, or guide at sea, on an airfield, etc.
Origin
Old English bēacn ‘sign, portent, ensign’, of West Germanic origin; related to beckon.
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GPS satellites have effectively replaced beacons, though lighthouses are still common and tall antennas continue to warn aircraft with flashing lights.
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