**Number - Simple English Wikipedia, the free encyclopedia**
https://simple.wikipedia.org/wiki/Number

A number is a concept from mathematics, used to count or measure.Depending on the field of mathematics, where numbers are used, there are different definitions: People use symbols to represent numbers; they call them numerals.Common places where numerals are used are for labeling, as in telephone numbers, for ordering, as in serial numbers, or to put a unique identifier, as in an ISBN, a ...

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