 Interleaved 2 of 5 (also known as I 2 of 5, I2/5, Code 25, or ITF) is a binary code that is widely used in logistics supply chains, most notably on corrugated cases. It uses a clever scheme of “interleaved” characters, where a set of bars and spaces comprised two data characters: one encoded in the bars and the other encoded in the intervening spaces. The structure of an I25 bar code consists of a start character consisting of four narrow elements, followed by an even number of data characters, followed by a stop character consisting of a wide bar, a narrow space, and a wide bar. A specific implementation of I25 defined by GS1, known as ITF-14, uses a Wide:Narrow ratio of 2.5:1 and is widely used on logistics supply units (typically corrugated boxes) to encode a 14 digit GTIN. |
