That is a logarithm to the base "e", where "e" is a number that is approximately 2.718.
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I think you are thinking "natural logarithm" which is ln (lowercase L, not I). If you have taken calculus you learn about logarithm and its relationship with exponents
Assuming that is the natural logarithm (logarithm to base e), the derivative of ln x is 1/x. For other bases, the derivative of logax = 1 / (x ln a), where ln a is the natural logarithm of a. Natural logarithms are based on the number e, which is approximately 2.718.
It turns out that many calculations and formulae are simpler if natural logarithms are used. To give but one example, the derivative (or slope) of the nagural logarithm function is 1/x. This means the derivative of other logarithms is more complicated.
LN is typically the syntax used to represent the natural logarithm function. Although some programming languages and computer applications use LOG to represent this function, most calculators and math textbooks use LN. In use, it would look like this:y=ln(x)Which reads as "y equals the natural logarithm of x".The natural logarithm is a logarithm that has a base of e, Euler's number, which is a mathematical constant represented by a lowercase italic e (similar to how pi is a constant represented by a symbol). Euler's number is approximately equal to 2.718281, although it continues on far past six decimal places.Functionally, the natural logarithm can be used to solve exponential equations and is very useful in differentiating functions that are raised to another function. Typically, when the solution to an equation calls for the trivial use of a logarithm (that is the logarithm is only being used as a tool to rewrite the equation), either the natural logarithm or the common logarithm (base 10) is used.
The natural logarithm of a variable x, is a variable y, such that ey = x. The constant e, is about 2.718281828, or more formally, e is a number such that the deriviative d/dx of ex = x.