An irrational number representing the ratio of the circumference of a circle to its diameter. 22/7 (3.142857) is often used as a close representation, 355/113 is closer at 3.141529.
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it is a number 3.14159265358979323846264338327950288... it's just a lot of numbers after that
Pi is a number defined as the ratio of the circumference to the diameter of a circle. many simplify it as 3.14, however, pi is an irrational number, so unless the number is specified in the directions or by the instructor, keep pi as its symbol similar to using an "x" in algebra
pi is not an abbreviation. It is a letter of the Greek alphabet symbol that symbolises one particular ratio.
Any mathematician will use the number pi (and its symbol) sooner or later - it is a number used extensively in many different areas of mathematics.
Depends on what symbol you are referring to.