Right conoid
In geometry, a right conoid is a ruled surface generated by a family of straight lines that all intersect perpendicularly to a fixed straight line, called the axis of the right conoid. Using a Cartesian coordinate system in three-dimensional space, if we take the z-axis to be the axis of a right conoid, then the right conoid can be represented by the parametric equations: x = v cos u {\displaystyle x=v\cos u} y = v sin u {\displaystyle y=v\sin u} z = h ( u ) {\displaystyle z=h(u)} where h(u) is some function for representing the height of the moving line.