Here is a few places where it can be used:
Drawings , machinery, plans,
planes, buildings, bridges,
geometry problems,
estimation, testing,
space science, architecture, and engineering
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Pi is a real number
Functions must have a property of predictability. So, there will never be a function (hence then this is a non-function) to predict the nth digit of pi. We can calculate the digits of pi in order one at a time, but there will never be a function that will take us directly to the 1,001st digit of pi.
The first time the symbol Pi was first used for Pi was in ancient Greece in their numbers. The symbol "π" was number 80 in Greece.
Real life is a real life example!
They are used to mount telescopes and binoculars.