The barcode you see on most retail products in the U.S. and Canada is known as a UPC-A, for universal product code, and the number comprises 12 digits. According to Geeky Camel, the first digit ...

Barcodes, which are made up of black stripes of varying thickness and a 12-digit number, help identify products and transformed the world of retail. They are now found on products all over the world.