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The meaning of each number in the bar code at the back of the sixth edition of Beijing Normal University Mathematics Book.
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The meaning of each number in the bar code at the back of the math book:

The meaning of 13 in the bar code diagram means that the first three digits indicate the origin (country) of the goods. The last four digits indicate the manufacturer's commodity name, which is uniformly assigned to the applied commodity name by the country (or region) coding organization. The next five numbers are the number of each product. Manufacturers classify products first, and then code them one by one. Manufacturers can code more than 654.38 million items. The last bit is the last check code, which is convenient for the scanner to check the whole code and avoid misreading.

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