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What does ln mean?
Ln is an operator, which means to find the natural logarithm, that is, the logarithm based on e.

E is a constant, equal to 2.7 1828 183…

Lnx can be understood as ln(x), that is, the logarithm of x with the base of e, that is, how many powers of e are equal to X.

lnx=loge^x

Extended data:

When the real number in the natural logarithm lnN is a continuous independent variable, it is called a logarithmic function and is denoted as y=lnx(x is the independent variable and y is the dependent variable).

The meaning of constant e is the limit value that can be achieved by doubling the growth continuously in unit time.

The base e of natural logarithm is given by an important limit.

E is an infinite acyclic decimal, and its value is approximately equal to 2.7 1828 1828459…, which is a transcendental number.

References:

Natural Logarithm-Baidu Encyclopedia