Too thick'n heavy with no fastening holes to be part of a door hinge. Door hinges aren't typically tapered.
Looking at the side view taper and its only 1/2 thickness, looks to be a wood cutting blade of some kind.
Not a small ax or hatchet blade, no visible means of attaching a handle that i can see although i think native Americans did attach stone blades to their tomahawks with leather bands somehow.
Its too small for a log splitter but could be an antique woodworking splitter for smaller woodworking jobs.
The two side protrusions could be there to prevent the wedge from becoming imbedded too deep in the wood preventing it from getting stuck.
That would be my guess, an antique woodworking splitter wedge OR a blade for an antique woodworking plane or tree bark shaving tool of some kind.
But those rectangular indentations are puzzling. They could be there for attaching a handle making it a hoe or scrapper of somekind which i doubt because looking at the top view the indentations aren't centered in the piece.
If those indentations are at the thickest end of the wedge maybe they're there for clamping and keeping the blade straight in a vintage woodworking plane.
All wild a$$ guesses at this point.