B0544800 (bo͝ol′rôr′ər)n. A small wooden slat attached to a string that makes a roaring noise when whirled.
bullroarer
(ˈbʊlˌrɔːrə) n (Instruments) a wooden slat attached to a thong that makes a roaring sound when the thong is whirled: used esp by native Australians in religious ritesEncyclopediaSeebull-roarer