n (context|journalism) A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use.
n (physics|rarely used) the Imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it.
n A discrete mass of a material that moves as a unit, usually through another material.
n (context|television editing) A black screen.
n (metal typesetting) A piece of type metal imprinted by a Linotype machine; also a black mark placed in the margin to indicate an error.