It's one of the feet from a KitchenAid mixer, though I suspect it may be used in other things as well.

Do you have a stand mixer? Is it in a position where a foot could fall into the dishwasher?

https://www.amazon.com/9709707-5-Pack-Whirlpool-KitchenAid-PartsBroz/dp/B07VV4GKW5

u/TheHouseOnTheCorner solved it with the comment above. Link to the original post

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