The Australian one ounce platinum piece (abbreviated as 1 oz and designated with Pt for "Platinum") is a bullion coin format. Uniquely, in Australia there are two mints authorised to strike legal tender: the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint which only makes collector and bullion coins, as well as other bullion products.
Both mints endeavour to create coins with attractive designs, and to introduce new designs and themes often, in order to raise the numismatic value of the coins over the value of previous metal used.
This coin is part of the long-running Australian Kangaroo bullion coin series by the Perth Mint.
The Mint says about it:
The Australian kangaroo is a large marsupial endemic to Australia. Identified by its muscular tail, strong back legs, large feet, short fur, and long, pointed ears, the animal has become a much-loved national icon. Struck by The Perth Mint from 1oz of 99.95% pure platinum, this coin is issued as legal tender under the Australian Currency Act 1965 with an unlimited mintage. | 
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