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Longer bars marking a barcode's edges and centre.
Also known as: Start stop pattern, Barcode guard bars
The pattern of bars at the start, middle and end of a retail barcode that tells a scanner where the code begins and how wide a module is.
Tells a scanner where a barcode begins and ends and how wide one module is.
Contexts: Packaging
Is what allows a barcode to be read at any size and at an angle, because the scanner measures the code against its own guard bars rather than against an absolute width.
Contexts: Packaging
Pairs of bars extending below the rest of the code at each end and at its centre, drawn longer than the data bars.