batten
n//ˈbæt(ə)n//lattor
(nautical) A long, narrow strip, originally of wood but now also of fibreglass, metal, etc., used for various purposes aboard a ship; especially one attached to a mast or spar for protection, one holding down the edge of a tarpaulin covering a hatch to prevent water from entering the hatch, one inserted in a pocket sewn on a sail to keep it flat, or one from which a hammock is suspended.