Oxford Dictionary of Units & Measures:
Fibonacci numbers
[Etymology: Leonardo Fibonacci of Pisa; c.1170-c.1250] mathematics Numbers in a sequence such that, following 1 and 1 (else 0 and 1), each is the sum of its two immediate predecessors, thus:
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584,…The ratio of one to its immediate predecessor progressively approximates, ever more closely, to the golden ratio. The sequential members occur in various areas of nature, e.g. the numbers of ancestors of a male bee, perhaps the branching of certain plants, and the spacing of our planets.
[Daintith J., Nelson R. D. (eds) The Penguin Dictionary of Mathematics (London: Penguin Books, 1989)]
Fibonacci, in a book of 1202, brought the Indo-Arabic numerals, with their zero cypher and decimal point, into European culture.
Fibonacci numbers
http://www.youtube.com/watch?v=e9MwNm0gXd8&feature=fvst
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