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Adding a textual answer will let us answer this question, along with other very similar questions.
Textual answers are useful for providing descriptions, and detailed answers to specific questions. However they can't be used to answer such a variety of questions as facts can.
According to ISBN.org, the abbreviation ISBN stands for International Standard Book Number, which is used to uniquely identify a book title by a 10-digit number divided in four parts. This number identifies books on an international scale. Each part of the number has a use, including a group or country identifier, a publisher identifier, a title identifier and a check digit. The check digit is the last number listed on the ISBN and is often a single digit that is used to validate the ISBN.References:Bowker: ISBN FAQ see the full page