Code 93

Code 93 is a bar code format capable of storing characters in the set:

0123456789[Space]ABCDEFGHIJKLMNOPQRSTUVWXYZ-.$/+%

There is also a Code 93 Extended variant which can store any of the 128 characters of the ASCII encoding. Characters outside the above range take more space on the bar code because they must be preceded by a control code.

Spec

 * Code 93 specification

Developer libraries and modules

 * ZBar bar code reader library: cross-platform
 * barcode.php

Utilities

 * Online barcode generator (supports many different formats)

Other info

 * Wikipedia article
 * Description of Code 93 and Code 93 Extended