0 a number that is part of a series in which each number is the sum (= total when added together) of the two numbers that come before it in the series, for example 0, 1, 1, 2, 3, 5, 8 ..:
The fruit of a pineapple is arranged in two interlocking helices, eight in one direction, thirteen in the other, each being a Fibonacci number.
Changes in trends very often correspond with Fibonacci numbers.
The progressions of Fibonacci numbers are commonly found in the growth rates and structures of nature.
What was curious was that the Fibonacci numbers cropped up all over the place in the botanical world - for instance, when you count the numbers of petals on flowers, or the spirals in which the seeds arrange themselves in the flower-head.
