ISBN is an abbreviation for International Standard Book Number. An ISBN is a machine-readable identification number that uniquely identifies a book. Book numbers began to be used in 1966, initially as a 9-digit book code (SBN) issued in the United Kingdom, and expanded to 10 digits in 1970 to become international.
| Valid symbols: | 0123456789 |
| length: | 10 symbols, not variable |
| Check digit: | One |
The ISBN assigned to books until 2006 has a length of 10 digits and consists of four fields of variable length.
For 13-digit ISBNs, GS1 prefix: 978 or 979.
Group identifier (language sharing country group).
Publisher code.
Item Number.
Checksum character or check digit.
"ISBN-10" barcode.
| information |
| A number that the operator can use if the label is damaged or cannot be scanned for some reason. "80-902734-1-6" is the number encoded in the barcode. |
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