Code 11, also known as USD-8, is a high-density numeric barcode symbology that was developed by Intermec in 1977.

It's primarily used in the telecommunications industry for labeling equipment.

The design of Code 11 barcodes is discrete, meaning each character is separated by a space, and it can encode any string of numeric digits from 0-9 and the dash (-) character.

A unique feature of Code 11 is that it includes a start/stop character, typically represented as an asterisk (*), which signals the beginning and end of the barcode.

Additionally, for enhanced data security, one or two modulo-11 check digits can be included, although this is optional.

The structure of Code 11 allows for varying widths of bars and spaces within the code, which contributes to its high-density format.

This flexibility in design means that Code 11 barcodes can be adapted to different printing specifications, making them versatile for various applications. Despite its utility, Code 11 is not considered very secure against imperfect printing, which can lead to misinterpretation of characters, hence the recommendation for including check digits.

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