The carving or construction of the rood screen often included latticework, which makes it possible to see through the screen partially from the nave into the chancel. The term "chancel" itself derives from the Latin word "cancelli" meaning "lattice"; a term which had long been applied to the low metalwork or stone screens that delineate the choir enclosure in early medieval Italian cathedrals and major churches. The passage through the rood screen was fitted with doors, which were kept locked except during services.