Assertion: mast's top | /r/HasProperty | platform
Facets:
Source sentences:
text: On many ships, sails above the top (a platform just above the lowest sail) were mounted on separate masts ("topmasts" or "topgallant masts") held in wooden sockets called "trestletrees".
text: The top on a traditional square rigged ship, is the platform at the upper end of each (lower) mast.