iterated Cartesian product with self: A × A × ... × A, n times.

Probably belongs to selma'o VUhU but, since it is iterated JOI, there is the case for that. First argument A is a set or similar object; second argument n is a nonnegative integer; the result is the cross-product of A with itself n times. Used as a shortcut for longer, arguably more preferable, constructions so that one can more closely say "R three" and mean R^3. Emphatically not equivalent to exponentiation; it only works on sets and similar objects. See also: te'a, pi'u, se'au.