it is a because thats what they wanted to do.
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bar code, Universal Product Code (code consisting of a series of vertical bars of variable width that are scanned by a laser; printed on consumer product packages to identify the item for a computer that provides the price and registers inventory information)
Yes, the routing number printed on the bottom of a check is used to sort the checks according to both the bank, and individual account on which they are drawn.
Horizontal triangles are used to save space in CPT and code descriptions that are not printed in their entirety next to a code number. They surround revised guidelines and notes. They are NOT used for revised coding descriptions.
a bar code or upc code (universal product code)
It might be possible to trace a product through a bar code, but it would depend on the product and the amount and type of data held in the associated computer network.