Function: noun
Etymology: Samuel Plimsoll † 1898 English shipping reformer
Date: 1884
: a load line or a set of load-line markings on an oceangoing cargo ship ― called also Plimsoll line
Plimsoll mark: TF tropical freshwater mark; F freshwater mark; T tropical load line; S summer load line; W winter load line; WNA winter load line, North Atlantic