'''Tuple''' is the formal mathematical term for what is written in formulae as (''a'',''b'',…,''z'') — a finite ordered collection of (possibly very different) elements. The Tcl counterpart is [list]s.

When all elements are of the same "type", it is more common to speak of it as a '''[vector]''' than a tuple.

The length of a tuple is the number of elements in it, and "''n''-tuple" is short for "tuple of length ''n''". 
There are 2-tuples (pairs), 3-tuples (triplets), 4-tuples (quadruplets), 5-tuples (pentuplets), etc., 
and of course also 1-tuples and 0-tuples, although mathematicians 
rarely bother about the latter unless they are being ''very'' formal. 

See also:
   * [Cartesian product]

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