Catacaustic
The curve which is the Envelope of reflected rays.
| Cardioid | Cusp of Cardioid | Nephroid |
| Circle | not on Circumference | Limaçon |
| Circle | on Circumference | Cardioid |
| Circle | point at  | Nephroid |
| Cissoid of Diocles | Focus | Cardioid |
| one arch of a Cycloid | rays Perpendicular axis | two arches of a Cycloid |
| Deltoid | point at infinity | Astroid |
 | rays Parallel axis | Catenary |
| Logarithmic Spiral | Origin | equal Logarithmic Spiral |
| Parabola | rays Perpendicular axis | Tschirnhausen Cubic |
| Quadrifolium | center | Astroid |
| Tschirnhausen Cubic | Focus | Semicubical Parabola |
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 60 and 207, 1972.
- Neuberg Circles
- Neumann Algebra
- Neumann Boundary Conditions
- Neumann Function
- Neumann Polynomial
- Neumann Series (Bessel Function)
- Neumann Series (Integral Equation)
- Neusis Construction
- Neville's Algorithm
- Neville Theta Function
- Newcomb's Paradox
- Newman-Conway Sequence
- Newton-Cotes Formulas
- Newtonian Form
- Newton Number
- Newton-Raphson Fractal
- Newton-Raphson Method
- Newton's Backward Difference Formula
- Newton's Diverging Parabolas
- Newton's Divided Difference Interpolation Formula
- Newton's Formulas
- Newton's Forward Difference Formula
- Newton's Identities
- Newton's Iteration
- Newton's Method