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Retailers use ‘Universal Product Code’ (UPC) to identify products in store. The same products being sold at different retail stores share the same UPC.
The leading digit of a UPC is called “number system”. Next five digits of a UPC are called “manufacturer code”. Then another five digits are called “Product Code”. The last digit is a check digit.
A UPCA barcode encodes 11 digits of numbers plus a check digit.