Abstract: A bar code applicator is provided, which may be incorporated into a booklet, comprised of a translucent sheet having on one side thereof pressure-transferrable figures comprising an array of bars, the bars adapted to be transferred by the user to the face of an envelope or the like in a predesignated position to designate individual letters or numbers, to be read by an optical character reader. There is further provided a booklet incorporating the applicator, having also one or more groups of sheets, each group comprising an instruction page, a bar code applicator and a separator sheet adjacent the bar code applicator.