Rub strake

Rub Rail, Rub Strake, Rub Guard
A rail on the outside of the hull of a boat to protect the hull from rubbing against piles, docks and other objects.
Rudder ...

Rub-rail - Also rubbing strake or rub strake. An applied or thickened member at the rail, running the length of the boat; serves to protect the hull when alongside a
pier or another boat.
Rudder - A vertical plate or board for steering a boat.

rub-rail: (also rubbing strake or rub strake.) an applied or thickened member at the rail, running at the rail, running the length of the boat; serves to protect the hull when alongside a pier or another boat a strip of wood, ...

See also: Rudder, Bow, Rigging, Tiller, Standing