the phi of n is the number of positive integers below n which do not share any factors with it. for example, the phi of 30 is 8 because it does not share any factors with 8 numbers: 1,7,11,13,17,19,23,29 these are called co-primes
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In statistics it could mean the sum of the values for the y-variable.
In math, Phi, or the Golden ratio is approximatly 1.6180339887.Otherwise, Phi is how you pronounce a greek letter.
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.