1： UPC
"UPC" stands for Universal Product Code. UPC bar codes were originally
created to help grocery stores speed up the checkout process and keep better
track of inventory, but the system quickly spread to all other retail
products because it was so successful.
You can see the manufacturer identification number in any standard 12-digit
UPC code
You can see that the UPC symbol printed on a package has two parts:
* The machine-readable bar code
* The human-readable 12-digit UPC number
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