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$\begingroup$It looks like a form of slot nut, perhaps for use in a metal panel with slots to allow some adjustment of the nut in the slot. I can't find anything like it on an image search. Where did you find the image?$\endgroup$
$\begingroup$Looks like a custom-made flange nut, but not exactly. It could perhaps be intended for a T-slot per previous comment, although those often have a thicker "flange" part, and are more rectangular. The eccentric feature and carefully made circular flange suggests a cam action.$\endgroup$
$\begingroup$I was searching for something eccentric that could serve as a kind of miniature cam and it came back in the internet search results. It's some kind of part used by food service equipment. Alto Shaam WS-25124 Washer Ct Eccentric Ml Blocks$\endgroup$
Alto Shaam WS-25124 Washer Ct Eccentric Ml Blocks$\endgroup$