NCR: See carbonless paper.
Negative: In photography, film containing an image in which values of the original are reversed so that the dark areas appear light and vice versa. In lithography; a film containing type or halftones in which the values are reversed, whites are black and blacks are clear film.
Newton Rings: In reproduction from either photography or lithography, an objectionable series or irregularly colored circles caused by the prismatic action of interfacing different smooth surfaces together, such as in contact frames or transparencies on a scanner drum.
Noise: Unwanted electronic or optical signals that cause interference in the reproduction of data or an image.
Number Up: Quantity of images placed on a single flat. (i.e. - 24 postcards can be imaged on a single 26x40 flat. - 24 up)