Interleaved 2 of 5 code is high density barcodes that encodes numeric data in the widths of bars and spaces. This barcode symbology is called "interleaved" because the first numeric data is encoded in first 5 bars and the second numeric data is encoded in first 5 spaces that separate these bars. Interleaved 2 of 5 barcode is 1D barcode symbology that is primarily used in distribution and warehousing industry.