Quantic
An 
-ary 
-ic polynomial (i.e., a Homogeneous Polynomial with constant Coefficients ofdegree in independent variables).
- R+
- Raabe's Test
- Rabbit Constant
- Rabbit-Duck Illusion
- Rabbit Sequence
- Rabdology
- Rabin-Miller Strong Pseudoprime Test
- Rabinovich-Fabrikant Equation
- Racah V-Coefficient
- Racah W-Coefficient
- Radau Quadrature
- Rademacher Function
- Radial Curve
- Radial Point
- Radian
- Radiant Point
- Radical
- Radical Axis
- Radical Center
- Radical Integer
- Radical Line
- Radicand
- Radius
- Radius (Graph)
- Radius of Convergence