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Universal Product Code. The Universal Product Code (UPC) is a barcode symbology that is widely used in the United States, Canada, United Kingdom, Australia, New Zealand, in European and other countries for tracking trade items in stores. UPC (technically refers to UPC-A) consists of 12 numeric digits, that are uniquely assigned to each trade item.
UPC version A is the basic version of UPC and is usually the version seen on grocery store items. The symbology is used to encode the 10 digit Universal Product Code. An eleventh digit indicates the type of product, and a twelfth digit is a modulo check digit.he first digit is a product type code. This is followed by 10 information carrying digits. The twelfth digit is a modulo check sum, and this is followed by a variable number of digits. There is a good explanation of the UPC Shipping Container Symbol (SCS) at the Infinity Graphics site.