Good old torspline algorithm with shape based toruses.
As shape for extrusion simple letter E from iso_csg library.
Animated version available at
http://news.povray.org/povray.binaries.animations/32078/227007/isotorspline.mpg

I do not know what are those double color endcaps. They are produced by
isosurface itself thought eval and detailed accuracy was used.

ABX

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