An ordered set of digits and/or letters that represents information that can be used to identify something.
A nominal number is not a number.
- Page numbers in a book are used to find a page, not count them.
- Here is a license plate number:
- A telephone number such as 375-8743, should be read as “three, seven, five, eight, seven, four, three. Reading it as “three hundred and seventy-five, eighty-seven, forty-three” is incorrect.