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The dollar is the most widely used currency in international transactions, [4] and a free-floating currency. It is also the official currency in several countries and the de facto currency in many others, [5] [6] with Federal Reserve Notes (and, in a few cases, U.S. coins) used in circulation.
A fixed exchange rate, often called a pegged exchange rate, is a type of exchange rate regime in which a currency's value is fixed or pegged by a monetary authority against the value of another currency, a basket of other currencies, or another measure of value, such as gold or silver.
The Joachimsthaler of the Kingdom of Bohemia was the first thaler (dollar). Dollar is the name of more than 25 currencies.The United States dollar, named after the international currency known as the Spanish dollar, was established in 1792 and is the first so named that still survives.
A reserve currency is a foreign currency that is held in significant quantities by central banks or other monetary authorities as part of their foreign exchange reserves. [citation needed] The reserve currency can be used in international transactions, international investments and all aspects of the global economy.
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A currency [a] is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. [ 1 ] [ 2 ] A more general definition is that a currency is a system of money in common use within a specific environment over time, especially for people in a nation state. [ 3 ]
The dollar sign, also known as the peso sign, is a currency symbol consisting of a capital S crossed with one or two vertical strokes ($ or depending on typeface), used to indicate the unit of various currencies around the world, including most currencies denominated "dollar" or "peso".