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.
I thought of hyoid, or vestigial pelvis, or odd wishbone, but the shapes of these bones varies a lot among species and a Google image search wasn’t getting me any hits that looked right.
It could be the gill collar of a fish. I’ve been trying to come up with some images and miserably failing since every picture is people with fish tattoos on their clavicles.