The term pi comes from the greek letter pi, which is the first letter of the word which in English is "perimeter".
Pi is a universal math term that is the same all over the world.
It isn't clear what you mean. I don't think that "pi form" is a commonly used math term.
Pi=3.14 in basic math
its a 2 lines and a wavy top over the two lines
In ordinary everyday letters . . . pi In Greek letters . . . Π
In math terms, pi, means 3.14, which is a everlasting decimal, that is just rounded to make your math easier. So pi, means 3.14 in math terms.
PI is a math term and pie is a food Pie tastes better. I do however wish pie never ended, but that would be irrational.
The number for pi is: 3.1415926535897932384626433832795