NAB cartridge: Broadcast standard endless loop magnetic tape cartridge standardized by the National Association of Broadcasters and made in three tape capacity sizes.
NAB spool: A magnetic tape spool with a large central hole standardized by the National Association of Broadcasters and available in a range of outer diameters.
nadgers: a small movement of a camera or prop. (Colloq.)
nanosecond (ns): One thousandth of a microsecond; 10-9 seconds.
narration: See voice over.
National Association of Broadcasters (NAB): US broadcasting industry trade association based in Washington whose name is now applied to standards which they have specified and to an annual convention and exhibition held in April at Las Vegas, USA. (Website: www.nab.org).