Teardrop Curve

A plane curve given by the parametric equations

$$x = \cos t$$

$$y = \sin t\sin^m({\textstyle{1\over 2}}t).$$

See also Pear-Shaped Curve

References

von Seggern, D. CRC Standard Curves and Surfaces. Boca Raton, FL: CRC Press, p. 174, 1993.