UPC stands for Universal Product Code. It is a barcode symbology that is widely used in North America, the UK, Australia, and New Zealand for tracking trade items in stores. A UPC code is uniquely assigned to each trade item. The most popular UPC barcode is the UPC-A, consisting of 12 numerical digits. According to GS1 standards, UPC along with the related EAN barcode are the only barcode systems allowed for scanning trade items at the point of sale. Read more about UPC on Wikipedia.