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.
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YES! the number pi is endless
(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .
Pi is irrational.
None, the Number Pi is nothing to do with seconds (time).
Pi rounded to the nearest whole number is 3.