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.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.