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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.
The UPC symbol has become known to most consumers as the barcode. This coded image is made up of a series of stripes located above a numeric code consisting of 12 digits. These stripes form numbers by using differing line widths grouped together. Each of the 12 numbers is represented by one block of 7 segments.