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Unicode Demystified by Richard Gillam

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Numbers

Written numbers are probably older than written words, and it's just as important to have characters for the writing of numeric values as it is to have characters for the writing of words. Unicode includes lots of digit and numeral characters, as well as many characters that do double duty as digits or numerals and as something else (usually letters or ideographs). In this section, we'll look at all of them.

Western Positional Notation

The numeration system we use in the United States and Europe is called positional, or place-value, notation. To write decimal numbers, positional notation makes use of nine basic “digit” characters that represent not only the values from one to nine, but also those values times the various powers of 10. ...

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