ISBN is the abbreviation of International Standard Book Number, and it is the international unified numbering method for publications published by ISO 1972. The copyright pages of regular books all have ISBN numbers. ISBN is the abbreviation of several English letters of the international standard for books, namely the international standard book number. It consists of 10 digits and consists of four parts: group number, publisher number, book title and inspection number, which are connected by "-". ISBN number consists of 10 digits, and * * is divided into four parts: 1. Group number: represents the publisher's country, geographical region, language, etc. China's group number is "7". 2. Publisher number: represents a specific publisher (publishing house, publishing company, etc.). ) belongs to the group. Set and assigned by the ISBN center of a country or region, 1-7 digits. 3. Title: The title is the number given to each publication by the publisher. 4. Inspection number: the inspection number is the last digit of the ISBN number. You can check whether the ISBN number is correct, that is, multiply the number of ISBN 1-9 by the nine digits of 10-2, and add the inspection number to the sum of these products. If it can be divisible by 1 1, the ISBN number will be. The formula is 7 *10+3 * 9+0 * 8+5 * 7+0 * 6+1* 5+5 * 4+6 * 3+8 * 2+7 =198,198. The inspection number can only be 1 digit, and when 10 is recorded as Roman numeral X. For example, the ISBN number of the Frontpage 98 Web Design book is: 7-118-01984-4, which stands for 7 and stands for China; 1 18, which stands for National Defense Industry Press; 0 1984 is the title of the book; 4, is the inspection code.