E is the exponential constant (base of natural logarithms), with numerical value .
Mathematical constant (see Section A.3.11).
E can be entered in StandardForm and InputForm as , ee or \[ExponentialE].
In StandardForm and TraditionalForm, E is printed as .
See The Mathematica Book: Section 1.1.3 and Section 3.2.8.
Implementation Notes: see section A.9.4.
See also: Exp.