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The United States dollar (symbol $; code USD; also abbreviated US$ to distinguish it from other dollardenominated currencies; referred to as the dollar, U.S. dollar, or American dollar) is the official currency of the United States and its territories per the Coinage Act of 1792.One dollar is divided into 100 cents (symbol ¢), or into 1000 mills for accounting and taxation purposes ...This means that the ratio of a pound to a dollar (15.52) roughly equals the ratio of a dollar to a pennyweight (15.47). These ratios are also very close to the ratio of a gram to a grain 15.43. Finally, in the United States, the ratio of the value of gold to the value of silver in the period from 1792 to 1873 averaged to about 15.5, being 15 ...
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