Universal Product Codes (UPC). A series of vertical lines and numbers which are unique to each individual product and identify it when computer scanned.

Printed lines on a ballot paper which are unique to each one, to ensure each paper can only be counted once.

Universal Product Codes (UPC). A bar code (often seen as a single word, barcode) is the small image of lines (bars) and spaces that is affixed to retail store items, identification cards, and postal mail to identify a particular product number, person, or location. The code uses a sequence of vertical bars and spaces to represent numbers and other symbols. A bar code symbol typically consists of five parts: a quiet zone, a start character, data characters (including an optional check character), a stop character, and another quiet zone