yardarm

/ˈjɑrdɑrm/
noun
  1. Either end of the horizontal spar (yard) on a sailing ship from which a square sail is hung.
    • The sailor climbed out onto the yardarm to furl the sail.
    • The flag was hoisted to the yardarm as the ship prepared to depart.
    • A lantern hung from the yardarm to signal other vessels at night.
Synonyms