The euro is the official currency of 20 of the 27 member states of the European Union. This group of states is officially known as the euro area or, more commonly, the eurozone. The euro is divided into 100 euro cents.
The franc is any of various units of currency. One franc is typically divided into 100 centimes. The name is said to derive from the Latin inscription francorum rex used on early French coins and until the 18th century, or from the French franc, meaning "frank".
In economics, hyperinflation is a very high and typically accelerating inflation. It quickly erodes the real value of the local currency, as the prices of all goods increase. This causes people to minimize their holdings in that currency as they usually switch to more stable foreign currencies. Effective capital controls and currency substitution ("dollarization") are the orthodox solutions to ending short-term hyperinflation; however there are significant social and economic costs to these policies. Ineffective implementations of these solutions often exacerbate the situation. Many governments choose to attempt to solve structural issues without resorting to those solutions, with the goal of bringing inflation down slowly while minimizing social costs of further economic shocks.
ISO 4217 is a standard published by the International Organization for Standardization (ISO) that defines alpha codes and numeric codes for the representation of currencies and provides information about the relationships between individual currencies and their minor units. This data is published in three tables:
Guilder is the English translation of the Dutch and German gulden, originally shortened from Middle High German guldin pfenninc. This was the term that became current in the southern and western parts of the Holy Roman Empire for the Fiorino d'oro. Hence, the name has often been interchangeable with florin.
A thaler or taler is one of the large silver coins minted in the states and territories of the Holy Roman Empire and the Habsburg monarchy during the Early Modern period. A thaler size silver coin has a diameter of about 40 mm and a weight of about 25 to 30 grams. The word is shortened from Joachimsthaler, the original thaler coin minted in Joachimsthal, Bohemia, from 1520.
The Deutsche Mark, abbreviated "DM" or "D-Mark" ( ), was the official currency of West Germany from 1948 until 1990 and later the unified Germany from 1990 until the adoption of the euro in 2002. In English, it was typically called the "Deutschmark". One Deutsche Mark was divided into 100 pfennigs.
Black Wednesday, or the 1992 sterling crisis, was a financial crisis that occurred on 16 September 1992 when the UK Government was forced to withdraw sterling from the (first) European Exchange Rate Mechanism , following a failed attempt to keep its exchange rate above the lower limit required for ERM participation. At that time, the United Kingdom held the Presidency of the Council of the European Union.
The Deutsche Bundesbank is the German member of the Eurosystem and has been the monetary authority for Germany from 1957 to 1998, issuing the Deutsche Mark (DM). It succeeded the Bank deutscher Länder, which had introduced the DM on 20 June 1948.
The East German mark, commonly called the eastern mark in West Germany and after reunification), in East Germany only Mark, was the currency of the German Democratic Republic. Its ISO 4217 currency code was DDM. The currency was known officially as the Deutsche Mark from 1948 to 1964, Mark der Deutschen Notenbank from 1964 to 1967, and from 1968 to 1990 as the Mark der DDR. The mark (M) was divided into 100 Pfennig (pf).
The mark was a currency or unit of account in many states. It is named for the mark unit of weight. The word mark comes from a merging of three Germanic words, Latinised in 9th-century post-classical Latin as marca, marcha, marha or marcus. It was a measure of weight mainly for gold and silver, commonly used throughout Europe and often equivalent to 8 troy ounces (250 g). Considerable variations, however, occurred throughout the Middle Ages.
The Swiss franc, or simply the franc, is the currency and legal tender of Switzerland and Liechtenstein. It is also legal tender in the Italian exclave of Campione d'Italia which is surrounded by Swiss territory. The Swiss National Bank (SNB) issues banknotes and the federal mint Swissmint issues coins.
The Reichsmark was the currency of Germany from 1924 until the fall of Nazi Germany in 1945, and in the American, British and French occupied zones of Germany, until 20 June 1948. The Reichsmark was then replaced by the Deutsche Mark, to become the currency of West Germany and then all of Germany after the 1990 reunification. The Reichsmark was used in the Soviet occupation zone of Germany until 23 June 1948, where it was replaced by the East German mark. The Reichsmark was subdivided into 100 Reichspfennig. The Mark is an ancient Germanic weight measure, traditionally a half pound, later used for several coins; Reich comes from the official name for the German state from 1871 to 1945, Deutsches Reich.
The German mark was the currency of the German Empire, which spanned from 1871 to 1918. The mark was paired with the minor unit of the pfennig (₰); 100 pfennigs were equivalent to 1 mark. The mark was on the gold standard from 1871 to 1914, but like most nations during World War I, the German Empire removed the gold backing in August 1914, and gold coins ceased to circulate.
A currency union is an intergovernmental agreement that involves two or more states sharing the same currency. These states may not necessarily have any further integration.
The Austro-Hungarian gulden (German), also known as the florin, forint, or zloty, was the currency of the lands of the House of Habsburg between 1754 and 1892, when it was replaced by the Austro-Hungarian krone as part of the introduction of the gold standard. In Austria, the gulden was initially divided into 60 kreuzers. The currency was decimalized in 1857, using the same names for the unit and subunit.
Hyperinflation affected the German Papiermark, the currency of the Weimar Republic, between 1921 and 1923, primarily in 1923. The German currency had seen significant inflation during the First World War due to the way in which the German government funded its war effort through borrowing, with debts of 156 billion marks by 1918. This national debt was substantially increased by 50 billion marks of reparations payable in cash and in-kind under the May 1921 London Schedule of Payments agreed after the Versailles treaty.
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.
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Allied-occupied Germany 
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Hamburg