Lévy C curve, a fractal. Here it's twisted into three dimensions and also over-scaled, (normally , here ). The image was created from using a "iterated function system", (IFS).
All freaktal images are from self-written tools. Linear fractals from my : "3D IFS studio" and "3D DTIFS" (dragon trees), non-linear IFS from "3D RJIFS" (3D rev Julia).