'e' is the letter used to represent the irrational number 2.71828 18284 59045 23536... . For further information, see the related links.
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In statistics it could mean the sum of the values for the y-variable.
A shape with a lot of sides and angles.
There is no specific meaning to rdw in mathematics.
Mathematics has lots of practical applications, if that's what you mean.
Lambda is usually specified to mean wavelength in mathematics and physics.