Nanometer   Net Data Density
A bar code verification term. Unit of measure used to define the wavelength of light.
A bar code verification term. The net data density of a linear bar code symbol is determined by dividing the number of characters in the symbol by the overall symbol length, measured from the leading edge of the start code to the trailing edge.
NIST   Nominal
NIST (National Institute of Standards and Technology),  is a non-regulatory federal agency within the U.S. Department of Commerce.
A bar code verification term. The exact (or ideal) intended value for a specified parameter. Tolerances are specified as positive and negative deviations from this value.