An ordinal number is a number which describes position in a well ordered set. Ordinal numbers are first, second, third, and so on. The assignment of ordinal numbers to members of a set can be arbitrary. For example, if you have a stamp collection, you can say that the oldest is the first stamp in your collection, or that the newest is the first stamp in the collection, or any other stamp is the first stamp in the set. Many sets can have more than one ordinality or ways to count the set.
|By Age||By Face Value||By Color|
The set of ordinal numbers is the same as the set of natural numbers.
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