Batten

A batten is most commonly a strip of solid material, historically wood but can also be of plastic, metal, or fiberglass. Battens are variously used in construction, sailing, and other fields.

In the lighting industry, battens refer to linear light fittings.

In the steel industry, battens used as furring may also be referred to as "top hats", in reference to the profile of the metal. Provided by Wikipedia