The Australian Aboriginal instrument is a didgeridoo (10 letters) and a bullroarer (10 letters). The didgeridoo is a wind instrument made from a hollowed tree trunk, traditionally used by Indigenous Australians of northern Australia. It is known for its distinctive drone sound and is used in ceremonies and performances. The bullroarer is a percussion instrument consisting of a weight attached to a length of string or rope. When swung in a circle, it creates a loud roaring sound. It is also used in ceremonies and performances by Indigenous Australians.