Financial Real Estate Math - What's the Name for the "Effective" Interest Rate?

[Kim Hopkins]

I have a math question for you! I'm trying to analyze our portfolio and have gotten into some pretty deep math calculations regarding interest rates and debt payments.

I want to know: is there a name for the percentage, call it "R", that is your total annual loan payment P divided by your total loan amount PV? 

I would call it the "effective interest rate" or something like that because R x PV = P. (The effective interest rate times your loan amount equals your annual loan payment).

To say it another way, in the classic loan amount formula below, is there a name for the "rate" R := r/(1-(1+r)^(-n)) circled below in red?