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Glossary
start/stop characters: Bar code characters that provide
the scanner with information on how the code is bounded
and its orientation. The start character is normally at the
left end of a horizontal code and adjacent to the most
significant character. The stop character is normally at the
end of a horizontal code and adjacent to the least
significant character.
symbology: The conventions, or rules, which govern the
formation of characters and strings in bar codes. The
language of the bar code symbol.
symbol density: The number of characters per
linear inch.
symbol length: The length of the symbol measured from
the beginning of the quiet area adjacent to the start
character to the end of the quiet area adjacent to a stop
character.
UPC: Acronym for Universal Product Code. The
standard bar code for retail food packages in the
United States.
vertical bar code: A code pattern in which the overall
coded area from start to stop is perpendicular to the
horizon. The individual bars appear as rungs of a ladder.
wedge interface: A programmable device with resident
memory capable of translating scanned bar code data so
that it appears that the data was manually entered on a
keyboard.
G–4
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