EAN-2

It is often used on magazines and periodicals to indicate an issue number.

The encoding of EAN-2 characters is very similar to that of the other European Article Numbers.

The structure of the barcode is based on the value of the two digit to be encoded.

The two digits treated as a single two-digit number is reduced modulo 4 and used to find the parity pattern to be used.

The parity pattern repeats every 4 values.

ISSN with an EAN-2 addon representing issue number 5.