I was actually about to post a comical video that starts with me splitting wood on the thing, and I decided I should refer to it by name. Otherwise it looks like I'm a nutcase, trying to split wood with a hammer. Then I realized I didn't know what the damn thing was called! And I've never seen another!

Very useful device! I'll be heartbroken when it finally wears out. But it wouldn't be too hard to build one.