Tuple - Wikipedia
https://en.wikipedia.org/wiki/Tuple
OverviewEtymologyPropertiesDefinitionsn-tuples of m-setsType theorySee alsoSourcesThe term originated as an abstraction of the sequence: single, couple/double, triple, quadruple, quintuple, sextuple, septuple, octuple, ..., n‑tuple, ..., where the prefixes are taken from the Latin names of the numerals. The unique 0-tuple is called the null tuple or empty tuple. A 1‑tuple is called a single (or singleton), a 2‑tuple is called an ordered pair or couple, and a 3‑tuple is called a triple (or triplet). The number n can be any nonnegative integer. For example, a complex number can be r…
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