Abbreviation for Neutral Density Filter. Attached to the front of the camera's lens, it reduces the amount of light entering the lens. When light levels are strong, such as when outdoors in sunshine, attaching an ND filter allows you to use both your maximum aperture and slower shutter speeds.
Developed by the BBC in the 1990s, NICAM is a TV sound encoding system. It enables the transmission of programmes in stereo and at 14-bit the sound quality is almost as good as CD. NICAM also allows for simultaneous multi-language broadcasts. To receive a broadcast with NICAM sound, your TV and/or VCR must be equipped with a NICAM decoder. And if you really want to know, it stands for Near Instantaneous Companded Audio Multiplex.
In the US and Japan, NTSC (National Standards Television Committee) is the standard used for all video equipment. NTSC uses 525 lines to make up a TV picture and scans at 60Hz. Unless otherwise specified, NTSC video equipment is only compatible with NTSC software and TV broadcasts.