Thinking about it, they're wishbone shaped. That's a bit ironic. Thanks, Odin. We get it. Wishbone-finding. A wishbone to find a wishbone.

There's something vaguely axe-head like about them too; one of those axes with a narrow head to pierce armor and cut deep, with the Y to hold the haft. I'm still tempted to say they were jotun's weapons, discarded in Valheim so we won't find the remains of the war on Midgard. :)