The term 'READ A UPC' refers to the process of using a barcode scanner to read the Universal Product Code (UPC) on a product. The UPC is a 12-digit code that is used to identify products and is found on most consumer goods. The process of reading a UPC requires a barcode scanner, which is a device that uses light to read the black and white lines of the UPC. The barcode scanner then translates the information into a digital format that can be read by a computer. The term 'SCAN' is a four-letter word that is used to describe this process.