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Symbology. The structural rules and conventions for representing data within a particular bar code type (e.g. UPC/EAN,
Code 39, PDF417, etc.).
T
Terminal Emulation. A "terminal emulation" emulates a character-based mainframe session on a remote non-mainframe
terminal, including all display features, commands and function keys.
Tolerance. Allowable deviation from the nominal bar or space width.
U
UPC. Universal Product Code. A relatively complex numeric symbology. Each character consists of two bars and two
spaces, each of which is any of four widths. The standard symbology for retail food packages in the United States.
V
Visible Laser Diode (VLD). A solid state device which produces visible laser light.
Glossary - 7
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