This weird bone here.
Context: a roadside curiosity shop/museum in Iceland, with random displays of bones of birds, sea mammals (including whales and orcas), and land mammals, as well as rocks and minerals and other tchotchkes.
Description: Palm-length, highly curved, light, maybe worn or broken off at the far ends (?). The photo doesn’t make it clear, but the part that I’m grasping in the photo curves back toward the far points as it loops over. I didn’t see any obvious articular surfaces anywhere along the bone.
There’s just the one photo, sorry.