Pi, a mathematical constant denoted by the Greek letter π ... The earliest recorded use of the Greek symbol π comes not from Greek antiquity but from 1706, when Welsh mathematician William ...

3.14258 D. 3.14289 Ans: A Explanation: The value of Pi is approximately 3.14159. It is mathematical constant and its symbol is π. 2. When Pi Day is celebrated around the world? Explanation ...

Actually, it's been playing it for three years (via GamesRadar). That's Pi as in the mathematical constant. The one you probably know as (at least) 3.14 but which goes on, well, forever if you let it.