Pi = circumference /diameter = 3.14159........ indicating that any circle of any diameter have the same ratio.
Archimedes spiral = A spiral structure goes towards a circle .
Golden ratio = it is a irrational number that find in many natural things like leaves , flower etc. The nautilus shells are also in spiral structure with golden ration.
Fibonacci series also follow the golden ration rule .
prime numbers = The prime numbers makes a similar to spiral like structure .
galaxies = most of the galaxies have similar to spiral structure.
e = 2.178........ also explain the expansion of universe .
The analysis of all above number and ratios explain about the spiral structure of the universe . The circle in the spiral structure seems to be a flat or cyclic universe .