Like a check but it is not a check?

What is the name for the numbers on the bottom of a bill.They are on many types of bills for example bank bill, credit card bill, phone bill etc. or:W

What is the name for the numbers on the bottom of a bill.
They are on many types of bills for example bank bill, credit card bill, phone bill etc.

or:What is the name for the numbers on the bottom of a bill.They are on many types of bills for example bank bill, credit card bill, phone bill etc.

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