A recent drive with my elderly mother took us to a road called "Swamp Creek Rd." near Joseph, Oregon and those fabulous Wallowa Mountains. I found several more barns that day for Tricia's Barn Charm meme. This is one of the more interesting ones because of the "decoration." I really don't know what it means...possibly, it's the owner's brand. I know I can find out if I just ask the right people.
(Some local research indicates this is the owner's brand. He is now in his 80's and goes south each winter.)