A triple is a (usually ordered) group of three elements, also called a triplet or triad. A triple is therefore a 3-tuple.
Triple
See also
Amicable Triple, Jacobi Triple Product, Monad, n-Tuple, Pair, Pythagorean Triple, Quadruple, Quintuplet, Scalar Triple Product, Tetrad, Triad, Trip-Let, Triple-Free Set, Triple Point, Triple Series, Triple Torus, Triply Periodic Function, Twins, Vector Triple ProductExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Triple." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Triple.html