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ISBN: ISBN FAQ's: What is a ISBN Number? The International Standard Book Number (ISBN) is a 10-digit number that uniquely identifies books and book-like products published internationally. Why do some ISBNs end in an "X"?  In the case of the check digit, the last digit of the ISBN, the upper case X can appear.  The Roman numeral X is used in lieu of 10 where ten would occur as a check digit. Why do I get a message saying "No match found"? You either typed in the wrong ISBN or the title is NOP (Not our publication).  For NOP titles, please visit your retail consumer (e.g. Barnes and Noble or Amazon.com) Company Policies - Ordering - Shipping