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The complete EAN-13 barcode number, consisting of the GS1 prefix, the manufacturer’s code, the product code, and the checksum digit, is also known as the GTIN, or Global Trade Item Number.Besides the national GS1 prefixes, typically used for standard retail items, there are prefixes for specialized purposes, such as coupons, refunds, serial publications (magazines and newspapers), books (ISBN), and sheet music (ISMN).A UPC-A barcode contains 12 digits, along with a quiet (blank) zone on either side, and start, middle, and stop symbols.The middle symbol separates the left side and the right side, which are coded differently.It consists of eight digits — four on the left side and four on the right.They use the same kind of encoding as UPC-A and EAN-13, with the last digit being used as a checksum.Code 3 of 9, Code 128 Auto (also with character sets A, B and C), GS1-128, Interleaved 2 of 5, MSI, ITF, QR-Code, GS1-QRCode, GS1 Data Bar POS Symbologies, Micro-QRCode, Data Matrix, GS1-Data Matrix, PDF417, USPS IMb, Postnet and Planet.
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Below is a list of common UPC-A applications: he UPC-E code’s most basic trick is to remove trailing zeroes in the manufacturer’s code, and leading zeroes in the product code.
The details of the technique are complicated, and it doesn’t work for everything, but it does cover all codes with a total of 5 leading/trailing zeroes, as well as a significant number of codes with four zeroes.
The UPC-A (also referred to simply as the UPC) is the standard retail “price code” barcode in the United States.
UPC-A is strictly numeric; the bars can only represent the digits from 0 to 9.