noun
Plimsoll mark; load line
A marking on the hull of a ship indicating the maximum safe loading depth. Technical maritime term.
船の側面にプリムソル標が描かれている。
The Plimsoll mark is painted on the side of the ship.
From English 'Plimsoll mark', named after Samuel Plimsoll, a British politician and social reformer who advocated for the load line regulation.