The common measure of value is Money.
It is also called Currency, and is of two kinds, viz.: coin and paper money.
Stamped pieces of metal having a value fixed by law are Coin or Specie.
Notes and bills issued by the government and banks, and authorized to be used as money, are Paper Money.
All moneys which, if offered, legally satisfy a debt are a Legal Tender.
UNITED STATES MONEY
The unit of United States or Federal money is the Dollar.
The dollar mark is probably a combination of U. S., the initials of the words “United States.”
The standard of United States money is the gold dollar. Gold is used because in itself it has great worth and little bulk, and because it varies very little in value.
Names of United States Coins