Pi is , with numerical value .
Mathematical constant (see Section A.3.11).
Pi can be entered in StandardForm and InputForm as , pi, p or \[Pi].
In StandardForm, Pi is printed as .
See Section 1.1.3 and Section 3.2.8.
Implementation Notes: see Section A.9.4.
See also: Degree.
New in Version 1; modified in 3.