# Number System - Ordinal Number (Magnitude)

An ordinal number, or ordinal, is a natural number used for ordering.

Ordering with numbers is also called ordering by magnitude.

In set theory (Mathematics), an ordinal number, or just ordinal, is the order type of a well-ordered set. Ordinals are an extension of the natural numbers different from integers and from cardinals.

## 3 - Documentation / Reference

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