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G–2
Glossary
Bar Code Density
The number of characters represented per unit of measurement (e.g.,
characters per inch in one-dimensional symbologies, characters per
square inch in PDF417).
Bar Height
The dimension of a bar measured perpendicular to the bar width.
Bar Width
Thickness of a bar measured from the edge closest to the symbol
start character to the trailing edge of the same bar code.
Bar Width Deviation
Increase or decrease in bar width as compared with nominal bar
width.
Baud Rate
A measure of data flow or number signaling events occurring per
second. When one bit is the standard event, this is the measure of
bits per second (bps). For example, a baud rate of 50 means
transmission of 50 bits of data per second.
Bidirectional Reading Capability
The ability to decode a symbol successfully by reading in
complementary (opposite) directions across bars and spaces.
Bit
Binary digit. One bit is the basic unit of binary information.
Generally, eight consecutive bits compose one byte of data. The
pattern of 0 and 1 values within the byte determines its meaning.
Buffer
An area of memory allocated for data storage. In this context, a
buffer's data storage capacity is needed when data can flow into the
device more quickly than the device can process that data. Buffering
the data preserves it until it can be processed.
Publication 2755-6.4
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