A boomerang is a thrown tool typically constructed with airfoil sections and designed to spin about an axis perpendicular to the direction of its flight. A returning boomerang is designed to return to the thrower, while a non-returning boomerang is designed as a weapon to be thrown straight and is traditionally used by some Aboriginal Australians for hunting.
Aerodynamic returning boomerang
A modern, plywood, returning boomerang
Various types of boomerangs from Australia, India, and Africa. A proposed evolution process from malga to boomerang is drawn on the upper side, while hatchet to boomerang is on the right.
Australian Aboriginal boomerangs
A woomera is an Australian Aboriginal wooden spear-throwing device. Similar to an atlatl, it serves as an extension of the human arm, enabling a spear to travel at a greater speed and force than possible with only the arm.
The woomera in this picture is the wooden object at left
Mokare with spear and woomera, another woomera lies at his feet.
A sharp stone attached to the end of the handle