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Bars of varying width encoding a product number.
Also known as: Product barcode, EAN-13
An EAN barcode encodes a thirteen-digit product number in the widths of its bars and spaces, with the last digit a check digit calculated from the others. The check digit is why a misread scan fails rather than returning the wrong product.
Encodes a thirteen-digit article number in the relative widths of alternating dark bars and light spaces.
Contexts: History
Ends in a check digit calculated from the preceding twelve, so a misread produces a failure rather than a wrong result.
Contexts: History
Carries a country or issuing-authority prefix in its first digits, which identifies where the number was assigned rather than where the product was made.
Contexts: History
A block of parallel vertical lines of differing thickness with numerals printed beneath them.