The bars that are at both ends and center of a UPC and EAN bar code type. They provide reference points for reading, serving a function similar to start/stop codes.
Bars at both ends and center of a UPC and EAN symbol, which provides reference points for scanning, similar to start/stop codes.
the tall bars used at the beginning, middle, and end of the U.P.C. and EAN bar code symbols to provide reference points for the scanner.
auxiliary characters at both ends and centre of EAN/UPC bar codes which provide reference points for scanning and act as start/stop characters.
Bars, which furnish reference points for scanning devices, found at the beginning, middle and end of U.P.C., and EAN symbologies.