e
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e  Code Point 

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The latin letter in is used in math to represent Euler’s Number. Euler’s number is a constant related to exponential growth that appears in many formulas and math equations as shorthand for the exponential function and as the base of the natural logarithm function.
The capital Latin letter E.
Euler's number is a naturally occurring number related to exponential growth and exponential decay.
Returns the natural logarithm of the number x.
A mathematical constant is a significant value that mathematecians have assigned a symbol representation.