This is a mount clip/bracket thingy for a Rubbermaid closet wire shelf. The original that came with the kit had the built in nailed anchor for drywall that got damaged when I needed to relocate the shelving. This version works best with Kreg-screw style washerhead screws.
For ideal print bed orientation, print with the screw hole's pointy side up on Z.
The author hasn't provided the model origin yet.