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WLS 8400 Product Reference Guide

GL-14

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.

2-dimensional (2D) symbology A machine-readable symbol which must be examined

both vertically and horizontally to read the entire

message. A 2D symbol may be one of two types of

machine-readable symbols: a Matrix Symbol or a

stacked symbol. 2D symbols differ from linear bar

codes with the ability for high data content, small

size, data efficiency and error correction capability.

UCC Uniform Code Council: the organization that

administers the U.P.C and other retail standards.

UCC.EAN-128 Code 128 with a Function 1 character in the first

position that is the symbology used with the

UCC.EAN format for a universal product number

(UPN).

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.

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