While the Australian dollar is sometimes referred to as A$, to distinguish it from other dollar-denominated currencies, it usually goes under the "$" sign and the "AUD" code. In this section, the AUD is paired against the USD (United States Dollar) the official currency of the United States, and the predominantly used currency in majority of While the Australian dollar is sometimes referred to as A$, to distinguish it from other dollar-denominated currencies, it usually goes under the "$" sign and the "AUD" code. In this section, the AUD is paired against the USD (United States Dollar) the official currency of the United States, and the predominantly used currency in majority of