These are simple Taijitus Tiles that can be used to play games such as Taiji or Trexo.
They fit into each other, so you can pile them on top of each other. Since the tiles interlock, you won't knock them over.
The symbols should be printed with a filament of another color and then inserted into the recesses in the tiles.
Here is a version for laser cutters.
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The author marked this model as their own original creation. Imported from Thingiverse.