It never ends so no one can list them all.
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No. pi/2 is a fraction but, since pi is irrational, so it pi/2.
The only one that I am aware of is the greek letter pi: π. There are many approximations, such as 3.14 or 3.14159 or 22/7. There are many functions whose solutions involve pi and so can be used to calculate pi. There are also many infinite series that converge to pi or some function of pi. Some are given in the attached link. However, these are all approximations to pi.
Pi is an irrational number, meaning it has an infinite number of non-repeating decimals. Therefore, it contains all possible combinations of numbers, from 0 to 9, in its decimal expansion. This implies that every single digit number appears in Pi an infinite number of times, although the exact sequence and frequency of these numbers cannot be predicted due to the random nature of Pi's digits.
pi is infinite pi is about 3.1415