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.
Cusp (singularity)
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In mathematics, a cusp, sometimes called spinode in old texts, is a point on a curve where a moving point must reverse direction. A typical example is given in the figure. A cusp is thus a type of sin
An ordinary cusp occurring as the caustic of light rays in the bottom of a teacup.