It is called "hannunvaakuna" in Finnish (or "käpälikkö" it seems), literal translation being "Hannu's coat of arms" and it's an old religious symbol similar to

It is called "hannunvaakuna" in Finnish (or "käpälikkö" it seems), literal translation being "Hannu's coat of arms" and it's an old religious symbol similar to pentagram or swastika. Used for protection against spirits and whatnot. Although that name has fallen out of common use and people just call it "komento" -> "command". A nice symbol though so can see why they went with it.