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About United States Dollar
The United States dollar is the official currency of the United States and several other countries. The Coinage Act of 1792 introduced the U.S. dollar at par with the Spanish silver dollar, divided it into 100 cents, and authorized the minting of coins denominated in dollars and cents. U.S. banknotes are issued in the form of Federal Reserve Notes, popularly called greenbacks due to their predominantly green color.
The U.S. dollar was originally defined under a bimetallic standard of 371.25 grains fine silver or, from 1834, 23.22 grains fine gold, or $20.67 per troy ounce. The Gold Standard Act of 1900 linked the dollar solely to gold. From 1934, its equivalence to gold was revised to $35 per troy ounce. In 1971 all links to gold were repealed. The U.S. dollar became an important international reserve currency after the First World War, and displaced the pound sterling as the world's primary reserve currency by the Bretton Woods Agreement towards the end of the Second World War. The dollar is the most widely used currency in international transactions, and a free-floating currency. WikipediaAbout Tongan Paʻanga
The paʻanga is the currency of Tonga. It is controlled by the National Reserve Bank of Tonga in Nukuʻalofa. The paʻanga is not convertible and is pegged to a basket of currencies comprising the Australian, New Zealand, and United States dollars and the Japanese yen.
The paʻanga is subdivided into 100 seniti. The ISO code is TOP, and the usual abbreviation is T$. In Tonga, the paʻanga is often referred to in English as the dollar, the seniti as the cent and the hau as the union. The unit of hau, is not used in everyday life and can be found only on commemorative coins of higher denominations. Wikipedia