Nephroid
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In geometry, a nephroid is a specific plane curve. It is a type of epicycloid in which the smaller circle's radius differs from the larger one by a factor of one-half.
Nephroid caustic at bottom of tea cup
Cardioid
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In geometry, a cardioid is a plane curve traced by a point on the perimeter of a circle that is rolling around a fixed circle of the same radius. It can also be defined as an epicycloid having a singl
The caustic appearing on the surface of this cup of coffee is a cardioid.
Boundary of the central, period 1, region of the Mandelbrot set is a precise cardioid.
Cardioid formed by light on a watch dial.