Curves


 * arc
 * Archimedean spiral
 * bell curve or bell-shaped curve
 * brachistochrone
 * cardioid
 * catenary
 * characteristic curve
 * circle
 * cissoid
 * closed
 * conchoid
 * crescent
 * cycloid
 * ellipse
 * epicycloid
 * equiangular spiral
 * evolute
 * French curve
 * Gaussian curve
 * helix
 * hyperbola
 * hypocycloid
 * involute
 * Jordan curve
 * lemniscate
 * logarithmic spiral
 * logistic curve
 * normal curve
 * oval
 * parabola
 * polar curve
 * sigmoid curve
 * simple closed
 * simple
 * sine curve
 * sinusoid
 * skew
 * solidus
 * spiral
 * spline
 * transition curve
 * trochoid