beacon (n.) Look up beacon at Dictionary.com
Old English beacen "sign, portent, lighthouse," from West Germanic *baukna "beacon, signal" (source also of Old Frisian baken, Old Saxon bokan, Old High German bouhhan); probably from Proto-Germanic *baukna- "beacon, signal," from suffixed form of PIE root *bha- (1) "to shine." Figurative use from c. 1600.