Unduloid

An unduloid, or onduloid, is a surface of revolution with constant nonzero mean curvature obtained by rolling an ellipse along a fixed line, tracing the focus, and revolving the resulting curve around the line.

Additional recommended knowledge

Correct Test Weight Handling Guide: 12 Practical Tips

Essential Laboratory Skills Guide

Weighing the right way

These curves are special cases of the shapes assumed by soap film spanning the gap between prescribed boundaries.^{[citation needed]}