==Etymology== The term originated as an abstraction of the sequence: single, 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. A 1‑tuple is called a singleton, a 2‑tuple is called an ordered pa...Found on http://en.wikipedia.org/wiki/Tuple
(pronounced TUH-pul or TOO-pul) A built-in Python datatype, which is an immutable ordered sequence of values. Note that only the sequence itself is immutable. If it contains a mutable value such as a dictionary, that value's content may be changed (e.g. adding new key/value pair). Any Python first-class object can be placed in a tuple as a value.Found on https://wiki.python.org/moin/PythonGlossary
A set of n coordinates representing a point in n-dimensional space, as defined by a spatial reference system. The British National Grid reference system is 2D only, so coordinate tuples consist of an easting and a northing coordinate.
Found on http://www.encyclo.co.uk/local/20195
A set of two related data items.Found on http://www.wildpackets.com/resources/compendium/glossary_of_networking_term
Immutable, can contain mixed types.Found on http://www.pythonforbeginners.com/cheatsheet/python-glossary
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