sternpost; body post
Nautical term for the main vertical timber or structural member at the stern of a wooden ship, to which the rudder is attached.
船尾材は船の後端にある重要な構造材です。
The sternpost is an important structural member at the rear end of a ship.
Compound of 船尾 (senbi, 'stern') + 材 (zai, 'timber, material').