In my experience it has mainly been, fibonacci/ phi/ golden section/ golden string
here is a couple of links from the university of surrey:
http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/fibnat.html
http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/fibnat2.html
Fibonacci Fact
Fibonacci was capable of quite remarkable calculating feats. He was able to find the positive solution of the following cubic equation:
x^3+2x^2+10x=20
What is even more remarkable is that he carried out all his working using the Babylonian system of mathematics which uses base 60. He gave the result as 1;22,7,42,33,4,40 which is equivalent to:
1+ 22/60 + 7/60^2 + 42/60^3 + 33/60^4 + 4/60^5 + 40/60^6
It is not known how he obtained this, but it was 300 years before anybody else could find such accurate results. It is quite interesting that Fibonacci gave the result in this way at the same time as telling everybody else to use the decimal number system!