Glossary -6
LT 1804 Product Reference Guide: Glossary
Symbol
A scannable unit that encodes data within the conventions of a certain
symbology, usually including start/stop characters, quiet zones, data
characters, and check characters.
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.
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.
Summary of Contents for LT 1804
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