Interleaved 2 of 5 is a numeric-only barcode that is widely used in warehouse and industrial applications. It is also called ITF-14/SCC-14.

The symbol can be as long as necessary to store the encoded data. The code is a high-density code.

The symbol is called "Interleaved" because a digit is encoded in the bars and the next digit is encoded in the spaces. There are five bars, two of which are wide; and five spaces, two of which are wide. Since the characters are interleaved in pairs, the barcode has to contain an even number of digits. If the barcode value contains an odd number of digits, a leading "0" will be added to the value.

An example: