Lighthouse

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lighthouse : a structure (such as a tower) with a powerful light that gives a continuous or intermittent signal to navigators — Webster See also OneLook

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Encyclopedia

Lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and to serve as a navigational aid for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and use of electronic navigational systems. — Wikipedia

Lighthouse (Encyclopædia Britannica)

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