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. 菠萝的果实上排列着互相连接的螺旋形，8个螺旋朝向一个方向，十三个螺旋朝向另一个方向，每个都符合斐波纳契数列。

Changes in trends very often correspond with Fibonacci numbers. 趋势的变化往往与斐波纳契数列相对应。