What does "E" mean in math when you answer a queastion?

E would most likely stand for exponent

The number e is a mathematical constant approximately equal to 2.71828 and is the base of the natural logarithm: the unique number whose natural logarithm is equal to one. It is the limit of (1 + 1/n) n as n approaches infinity, an expression that arises in the study of compound interest. The internet says this. : D