Veljko's Looped Coil:

This space curve was produced using the following Maple commands:

> x:=sin(3*t)*cos(t);
> y:=sin(3*t)*sin(t);
> z:=t;

                         x := sin(3 t) cos(t)


                         y := sin(3 t) sin(t)


                                z := t

> with(plots):
> spacecurve([x,y,z],t=0..10,numpoints=1000,
>  axes='NORMAL',orientation=[70,70],thickness=2);