ISBN
| Publisher | Digits |
| Addison-Wesley | 0-201 |
| Amer. Math. Soc. | 0-821 |
| Birkhäuser Basel | 3-7643 |
| Birkhäuser Boston | 0-8176 |
| Cambridge University Press | 0-521 |
| CRC Press | 0-8493 |
| Dover | 0-486 |
| McGraw-Hill | 0-070 |
| Oxford University Press | 0-198 |
| Springer-Verlag Berlin | 3-540 |
| Springer-Verlag New York | 0-387 |
| Tarquin Publications | 0-906212 |
| Wiley | 0-471 |
The International Standard Book Number (ISBN) is a 10-digit Code which is used to uniquely identify a book. The digits
are arranged in four groups. The first group is a single digit which codes country or language in which a publisher isincorporated: 0 for English, 2 for French, 3 for German, etc. The next group of digits specifies the publisher, and may rangein length from two to seven digits, with fewer digits used for larger publishers. The third group of digits specifies anindividual book, and may be from one to six digits in length. The last digit 
is a check digit which may be in therange 0-9 or X (where X is the Roman Numeral for 10). The check digit is computed from the equation
For example, the number for this book is 0-8493-9640-9, and
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References
Hill, R. First Course in Coding Theory. Oxford, England: Oxford University Press, 1986.
- Unbiased
- Uncia
- Uncorrelated
- Uncountable Set
- Uncountably Infinite Set
- Undecagon
- Undecidable
- Undecillion
- Undetermined Coefficients Method
- Undulating Number
- Unduloid
- Unexpected Hanging Paradox
- Unfinished Game
- Unhappy Number
- Unicursal Circuit
- Uniform Apodization Function
- Uniform Boundedness Principle
- Uniform Convergence
- Uniform Distribution
- Uniform Polyhedron
- Uniform Variate
- Unimodal Distribution
- Unimodal Sequence
- Unimodular Group
- Unimodular Matrix