A braided knot, made from one continuous string, intricate and interesting to play with or keep on your desk for visual delight.
Can even stand up, if balanced on exactly the right spot! Looks really nice.
Get the high quality stl for a small but much appreciated support-the-designer-fee:
Link to stl
Or, buy it 3d-printed here in many materials, including bronze, iron, and others!
Link to shop
Sliced with Cura - print it laying down, and use supports (up from around 50°, 8% infill) only where the model will overlap on the build plate, not everywhere, otherwise the clean up will be much harder and next to impossible inside the braids.