ISBN13n

ISBN13n, or ISBN-13 with a check digit of 'n', is a specific type of International Standard Book Number (ISBN) used to uniquely identify books. The ISBN system is a numeric commercial book identifier that is intended to be unique. The ISBN-13 format, introduced in 2007, consists of 13 digits, including a check digit. The first three digits represent the country or region, the next group (usually 1-5 digits) identifies the publisher, and the last group (usually 3-5 digits) identifies the specific title. The check digit, 'n', is calculated using a specific algorithm to ensure the validity of the ISBN. This check digit is not a random number but is determined by the other digits in the ISBN. The use of ISBN13n helps to prevent errors in book identification and is a crucial part of the global book industry's infrastructure.