batten

1. A plank or strip of wood, or several of such strips arranged side by side, used in construction to hold members of a structure together, to provide a fixing point, to strengthen, or to prevent warping.
2. A strip of wood holding a number of lamps; especially (theater), one used for illuminating a stage; (by extension, also attributive) a long bar, usually metal, affixed to the ceiling or fly system and used to support curtains, scenery, etc.
3. 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.
4. The movable bar of a loom, which strikes home or closes the threads of a woof.

Plural battens