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Countably Infinite Cardinality Type

A set of numbers is called countably infinite if there is a way to enumerate them. Formally this is done with a bijection function that associates each number in the set with exactly one of the positive integers. The set of all fractions is also countably infinite. In other words, any set $X$ that has the same cardinality as the set of the natural numbers, or $| X | \; = \; | \mathbb N | \; = \; \aleph0$, is said to be a countably infinite set.

countable

http://www.math.vanderbilt.edu/~schectex/courses/infinity.pdf