Code 39 (also called Code 3-of-9) is the symobology used in bar code labels for computer tape media. The symbology is self-explanatory, since for every nine elements it has three wide elements. An element is a black, non-reflective bar, but it can also be a white, reflective space.
The Code 39 Symbology Apart from having the standard bars and spaces, an additional feature that the code 39 symbology has is an asterisk used as a stop and start character.
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