NLS-Glossary

This language is a variation of the Code 128 symbology designed primarily for product/shipment identification applications. The GS1-128 specification uses the same code set as Code 128, however a special character (function 1) is used as part of the start code in the symbol. In addition, this symbol utilizes standardized application identifiers (AI’s).

The auxiliary characters at both ends and center of EAN and UPC bar code symbols which provide reference points for scanning. In most cases the bars of these auxiliary characters are elongated. The guard bar function as start/stop characters; for omni-directional scanning the center guard bar (where present) acts as a stop character and the outer guard bars act as two separate start characters. There are no center guard bars on UPC-E symbols.

The bars that are at both ends and center of a UPC and EAN bar code type. They provide reference points for reading, serving a function similar to start/stop codes.

Kirchhoff's law of thermal radiation, postulated by a German physicist Gustav Robert Kirchhoff, states that the emissivity and the absorptivity of a surface at a given temperature and wavelength are equal.

A bar code type presented in such a manner that its overall length dimension is parallel to the horizon. The bars are presented in an array which looks like a picket fence.

The numbers and letters that appear below a barcode symbol, which correspond to the data that is encoded in the symbol. The human readable interpretation makes it possible for a human operator to enter data manually in the event of a scanner misread.