This is the function power(e,n), where e is approximately 2.718281828 (also known as Euler's Number), and n is the number of times it should be multiplied by itself. This basically says "how much growth do I get after n units of time (and 100% continuous growth)?". So exp(3) would return 20.08, which means that after 3 time units we have 20.08 times the amount we started with.
|n||The power of e.|
val = exp(2);
This will set val to e^2, around 7.4.