I will guess a toilet seat hinge, lower part. The part that bolts to the bowl. That would give it the hole shown, the riser (ring around the base) possibly, and the two front "fins" would be the remains of where the rod went through to the other hinge.
But without a screen cap for sure it would be only a guess. And it is to late for me to get the BluRays out.
There have to be some exhibit or screen caps around.