A tuple is a sequence of elements of potentially mixed types. Formally, a tuple is an element e of a Cartesian product of a given number of sets: e ∈ (S1 × S2 × … × Sn). A two-element tuple is called a pair [e.g., e ∈ (A × B)]. A three-element tuple is called a triple [e.g., e ∈ (A × B × C)]. A tuple typically contains unordered, heterogeneous elements akin to a struct in C with the exception that a tuple is indexed by numbers (like a list) rather than by field names (like a struct). While tuples can be heterogeneous, in a list of tuples, each tuple in the list must be of the same type. Elements of a tuple are accessible by prefacing the tuple with #n, where n is the number of the element, starting with 1:
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