ISBN (an acronym for International Standard Book Number) is
|“||[a] unique identifier assigned to a monographic publication by designated agencies in each country participating in the program. The U.S. Copyright Office does not assign these numbers to published works. In the United States, ISBNs are administered by R.R. Bowker LLC.||”|
- ↑ Compendium of U.S. Copyright Office Practices, Third Edition, Glossary, at 10.