Symbol LS 3408, Product Reference Manual

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Glossary
GL-13
Space The lighter element of a bar code formed by the background
between bars.
Space Width The thickness of a space measured from the edge closest
to the symbol start character to the trailing edge of the
same space.
Specular Reflection The mirror-like direct reflection of light from a surface,
which can cause difficulty decoding a bar code.
Stacked Symbol (2D Symbols) A 2-dimensional (2D) symbol with sequences of linear
(width-coded) data that are stacked one upon another (i.e.,
PDF417).
Start/Stop Character A pattern of bars and spaces that provides the scanner with
start and stop reading instructions and scanning direction.
The start and stop characters are normally to the left and
right margins of a horizontal code.
Substrate A foundation material on which a substance or image is
placed.
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 Density The number of data characters per unit length; usually
expressed as characters per inch (CPI).
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).
Tilt Rotation of a bar code symbol on an axis perpendicular to
the substrate.
Tolerance Allowable deviation from the nominal bar or space width.