The Supreme Court of Western Australia as well as the independent Pacific Island states of Kiribati, Nauru, Papua New Guinea, Tonga, Tuvalu and Vanuatu use which abbreviation for their currency?
Supreme Court of Western Australia:  It has unlimited jurisdiction within the state in civil matters (although it usually only hears matters involving sums of A$750,000 or more), and hears the most serious criminal matters. Australian dollar: The Australian dollar (sign: $; code: AUD) is the currency of the Commonwealth of Australia, including its external territories Christmas Island, Cocos (Keeling) Islands, and Norfolk Island, as well as the independent Pacific Island states of Kiribati, Nauru, Papua New Guinea, Tonga, Tuvalu and Vanuatu. Australian dollar:  Within Australia, it is almost always abbreviated with the dollar sign ($), with A$ or AU$ sometimes used to distinguish it from other dollar-denominated currencies.
$