BAR CODING
Bar coding is popular in sales work. The usual format is to have a series of lines of varying thickness in relation to each other on the side of the item for sale. At the point of sale, a light pen is passed over this area. The light pen sends the computer a signal according to the scanned lines. The lines themselves indicate what the item is and what it costs. This saves the sales assistant the trouble of keying in the price of individual items and also makes a record of one more item being sold to safeguard stock levels. Less often the bar code forms the media for programs and data storage, in video cassette recorders.
The most common format is called the universal product code (UPC), Fig. B/2, other formats called Interleave 2 of ...
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