noun
definition
A signal fire to notify of the approach of an enemy, or to give any notice, commonly of warning.
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(nautical) A signal, buoy, post, or other conspicuous mark erected on an eminence near the shore, or moored in shoal water, as a guide to mariners, particularly to warn vessels of danger.
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A high hill or other easily distinguishable object near the shore which can serve as guidance for seafarers.
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(figurative) That which gives notice of danger, hope, etc., or keeps people on the correct path; a source of inspiration.
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An electronic device that broadcasts a signal to nearby portable devices, enabling smartphones etc. to perform actions when in physical proximity to the beacon.
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(Internet) Short for web beacon.