Fishing lure. You will need to add an appropriately sized split ring and a treble hook before you can catch anything.
An alternate version that has been smoothed to soften sharpp edges may be found at the following
link
https://www.shapeways.com/product/DM4X4JKA2/fishing-lure-hexagonal-pits-smoothed?key=6ab41794039f3281129c6e0c02baa8da