Symbol SE 923, Integration Manual

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Glossary-7
Glossary
Symbol Aspect Ratio The ratio of symbol height to symbol width.
Symbol Height The distance between the outside edges of the quiet zones of the first
row and the last row.
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.