Symbol LS4000P Series, Product Reference Manual

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Glossary-6
LS 4000P Series Product Reference Guide
Symbol Length Length of symbol measured from the beginning of the quiet zone (margin)
adjacent to the start character to the end of the quiet zone (margin) adjacent
to a stop character.
Symbology The structural rules and conventions for representing data within a particular
bar code type (e.g. UPC/EAN, Code 39).
Tolerance Allowable deviation from the nominal bar or space width.
TxD Transmitted data.
UPC Universal Product Code. A relatively complex numeric symbology. Each
character consists of two bars and two spaces, each of which can be any of four
widths. The standard symbology for retail food packages in the United States.
Visible Laser Diode
(VLD) A solid state device which produces visible laser light. Laser light emitted from
the diode has a wavelength of 670 to 680 nanometers.