Inverted 2 of 5 is a rarely-used variant of the Industrial 2 of 5 format. Similar to the Code 2 of 5 symbology, this barcode encodes information using 2 wide and 3 narrow elements. Unlike other barcode types, however, Inverted 2 of 5 encodes information in spaces rather than bars. Except for the start and stop symbols, all bars are the same width. This barcode can only contain numeric characters 0-9.