+A **transfinite ordinal** is an [ordinal number](/wiki/ordinal_number) that is not finite, extending the concept of counting beyond the natural numbers. It represents the "length" of an infinite [well-ordered set](/wiki/well_ordered_set), providing a way to sequence even unbounded collections.
+## See also
+- [Cardinal Number](/wiki/cardinal_number)
+- [Set Theory](/wiki/set_theory)
+- [Infinite Set](/wiki/infinite_set)