Noun

1. A signal fire to notify of the approach of an enemy, or to give any notice, commonly of warning or guiding.
2. A signal or conspicuous mark erected on an eminence near the shore, or moored in shoal water, as a guide to mariners.

   • A post or buoy placed over a shoal or bank to warn vessels of danger; also a signal mark on land. (FM 55-501).

3. A high hill or other easily distinguishable object near the shore which can serve as guidance for seafarers.
4. That which gives notice of danger.

See also

• cairn
• leading mark
• navigation aid
• navigation mark
• radar reflector
• sea mark, seamark