Hello how may I help you? What is that thing called that you throw in the air and then it comes back to you? Your description matches that of a ball. hmm, no it is not a ball. Your description also matches a hacky sack. Could that be it? no, it is not a hacky sack. It is somethings Australians use Your description could also be referring to a rock. No it is not a rock What other information do you have about this object? Hunters in Australia used it as a tool Are you thinking of a boomerang? yes, that is it, a boomerang Glad I could help!