Quadruple

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A quadruple is a term from mathematics, depicting an n-tuple with n being 4. This means it depicts four elements, with the order of the elements carrying meaning. This differs from a set, where the order of the elements is meaningless and where no element could exist more than once. Derived from this abstract meaning, it is used in several other contexts including:

Quadruplets refer to 4 children birthed in one pregnancy.
A quadruplet can refer to a type of note in music (see tuplet.)
Quadruple can refer to a redundant backup system that has 3 secondary systems to take over if the primary fails.
A quadruple can refer to a set of four numbers in a given order, for example, describing the location of a point in four-dimensions (much like an ordered pair.)