The rules that determine the way that barcode data is encoded into bars and spaces are collectively called a “symbology.” A barcode symbol is a sequence of printed lines, or bars, and intervening spaces. The number and width of the spaces is determined by a specification for each symbology. The two types of linear barcode symbologies are discrete and continuous Discrete barcodes start and end with a bar, and have an intercharacter gap, or spaces between characters. Continuous barcodes have no intercharacter gap, start with a bar, and end with a space.
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Code 39 | Code 93
Codabar | Code 128
EAN | Interleaved 2 of 5
MSI | UPC
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