An -tuple, sometimes simply called a "tuple" when the number is known implicitly, is another word for a list, i.e., an ordered set of elements. It can be interpreted as a vector, or more specifically, an n-vector.
In the Wolfram Language, -tuples of length in the alphabet consisting of the members in a list can be enumerated using Tuples[list, n].
The following table summarizes special names given to -tuples for small .