Topic summary
KarTrak ACI
Extracted from the Wikipedia article KarTrak.
Tags and label design
KarTrak ACI tags consisted of a plate with 13 horizontal labels put in a vertical arrangement that are also understood as data lines, which could have 13 different forms. These labels, or symbols, stand for the single digits 0–9, the number 10 as an extra feature for the checksum line, and the "START" and "STOP" labels that gave reference to the vertical line position of the tag. Modern depictions of the labels often name the upper color first and then the lower color.