That is related to "composition", the composition of functions. That means you apply one function after another.
f(g(x)) means you first apply function "g" to the variable "x", then you apply function "f" to the result.
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Composition Means When You Compose A Story Or Put Something Together.
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.