A coin is a small object, usually round and flat, used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in large quantities at a mint in order to facilitate trade. They are most often issued by a government. Coins often have images, numerals, or text on them. Obverse and its opposite, reverse, refer to the two flat faces of coins and medals. In this usage, obverse means the front face of the object and reverse means the back face. The obverse of a coin is commonly called heads, because it often depicts the head of a prominent person, and the reverse is known as tails.
The drachma was the currency used in Greece during several periods in its history:
- An ancient Greek currency unit issued by many Greek city states during a period of ten centuries, from the Archaic period throughout the Classical period, the Hellenistic period up to the Roman period under Greek Imperial Coinage.
- Three modern Greek currencies, the first introduced in 1832 by the Greek King Otto (Όθων) and the last replaced by the euro in 2001. The euro did not begin circulating until 2001 but the exchange rate was fixed on 19 June 2000, with legal introduction of the euro taking place in January 2002.
The standard circulating coinage of the United Kingdom, British Crown Dependencies and British Overseas Territories is denominated in pennies and pounds sterling, and ranges in value from one penny sterling to two pounds. Since decimalisation, on 15 February 1971, the pound has been divided into 100 (new) pence. Before decimalisation, twelve pence made a shilling, and twenty shillings made a pound.
There are eight euro coin denominations, ranging from one cent to two euros. The coins first came into use in 2002. They have a common reverse, portraying a map of Europe, but each country in the eurozone has its own design on the obverse, which means that each coin has a variety of different designs in circulation at once. Four European microstates that are not members of the European Union use the euro as their currency and also have the right to mint coins with their own designs on the obverse side.
Roman currency for most of Roman history consisted of gold, silver, bronze, orichalcum and copper coinage. From its introduction to the Republic, during the third century BC, well into Imperial times, Roman currency saw many changes in form, denomination, and composition. A persistent feature was the inflationary debasement and replacement of coins over the centuries. Notable examples of this followed the reforms of Diocletian. This trend continued into Byzantine times.
Byzantine currency, money used in the Eastern Roman Empire after the fall of the West, consisted of mainly two types of coins: the gold solidus and a variety of clearly valued bronze coins. By the end of the empire the currency was issued only in silver stavrata and minor copper coins with no gold issue.
The half sovereign is a British gold coin with a nominal value of half of one pound sterling. It is half the weight of its counterpart 'full' sovereign coin.
The dime, in United States usage, is a ten-cent coin, one tenth of a United States dollar, labeled formally as "one dime". The denomination was first authorized by the Coinage Act of 1792.
Roman Republican currency refers to the coinage struck by the various magistrates of the Roman Republic, to be used as legal tender. In modern times, the abbreviation RRC, "Roman Republican Coinage" originally the name of a reference work on the topic by Michael H. Crawford, has come to be used as an identifying tag for coins assigned a number in that work, such as RRC 367.
The Coinage of India began anywhere between early 1st millennium BCE to the 6th century BCE, and consisted mainly of copper and silver coins in its initial stage. The coins of this period were Karshapanas or Pana. A variety of earliest Indian coins, however, unlike those circulated in West Asia, were stamped bars of metal, suggesting that the innovation of stamped currency was added to a pre-existing form of token currency which had already been present in the Janapadas and Mahajanapada kingdoms of the Early historic India. The kingdoms that minted their own coins included Gandhara, Kuntala, Kuru, Magadha, Panchala, Shakya, Surasena, Surashtra and Vidarbha etc.
There have been three sets of coins in Ireland since independence. In all three, the coin showed a Celtic harp on the obverse. The pre-decimal coins of the Irish pound had realistic animals on the reverse; the decimal coins retained some of these but featured ornamental birds on the lower denominations; and the euro coins used the common design of the euro currencies. The pre-decimal and original decimal coins were of the same dimensions as the same-denomination British coins, as the Irish pound was in currency union with the British pound sterling. British coins were widely accepted in Ireland, and conversely to a lesser extent. In 1979 Ireland joined the Exchange Rate Mechanism and the Irish pound left parity with sterling; coin designs introduced after this differed between the two countries.
This glossary of numismatics is a list of definitions of terms and concepts relevant to numismatics and coin collecting, as well as sub-fields and related disciplines, with concise explanations for the beginner or professional.
Aksumite currency was coinage produced and used within the Kingdom of Aksum centered in present-day Eritrea and Ethiopia. Its mintages were issued and circulated from the reign of King Endubis around AD 270 until it began its decline in the first half of the 7th century. During the succeeding medieval period, Mogadishu currency, minted by the Sultanate of Mogadishu, was the most widely circulated currency in the Horn of Africa.
Silver coins are considered the oldest mass-produced form of coinage. Silver has been used as a coinage metal since the times of the Greeks; their silver drachmas were popular trade coins. The ancient Persians used silver coins between 612–330 BC. Before 1797, British pennies were made of silver.
The Achaemenid Empire issued coins from 520 BCE–450 BCE to 330 BCE. The Persian daric was the first gold coin which, along with a similar silver coin, the siglos represented the first bimetallic monetary standard. It seems that before the Persians issued their own coinage, a continuation of Lydian coinage under Persian rule is likely. Achaemenid coinage includes the official imperial issues, as well as coins issued by the Achaemenid provincial governors (satraps), such as those stationed in Asia Minor.
The coins of Canada are produced by the Royal Canadian Mint and denominated in Canadian dollars ($) and the subunit of dollars, cents (¢). An effigy of the reigning monarch always appears on the obverse of all coins. There are standard images which appear on the reverse, but there are also commemorative and numismatic issues with different images on the reverse.
The Australian Shilling, informally called a "bob", was a type of silver coinage issued by the Commonwealth of Australia, that circulated prior to the decimalisation of Australian coinage. The Australian shilling was derived from the British pre-decimal sterling pound system and was first issued following the passing of the Australian Coinage Act 1909, which established Australia's first formal currency system. The shilling was issued as part of Australia's silver coinage, which included the two-shilling (florin), the sixpence and the threepence. The shilling was minted from 1910 until 1963. During this period there was one significant modification to the design of the Australian shilling, the change in its reverse design, which occurred in 1938 when the design was altered from the Australian Coat of Arms (1910-1936) to the visage of a Merino ram’s head (1938-1963).
Before the introduction of the euro, the current eurozone members issued their own individual national coinage, most of which featured mint marks, privy marks and/or mint master marks. These marks have been continued as a part of the national designs of the euro coins, as well. This article serves to list the information about the various types of identifying marks on euro coins, including engraver and designer initials and the unique edge inscriptions found on the €2 coins.
The one mil coin was the smallest denomination of the Hong Kong dollar from 1863 to 1866, after this date it was no longer issued but may have circulated much longer. Its value was one tenth of a cent, or a thousandth of a dollar. It was minted by the Royal Mint, it features the Royal cypher of "VR", of the reigning monarch Queen Victoria at the time, but didn't feature a profile of the face of the monarch as all other coins did, due to the hole in the middle.
Carthaginian or Punic currency refers to the coins of ancient Carthage, a Phoenician city-state located near present-day Tunis, Tunisia. Between the late fifth century BC and its destruction in 146 BC, Carthage produced a wide range of coinage in gold, electrum, silver, billon, and bronze. The base denomination was the shekel, probably pronounced in Punic. Only a minority of Carthaginian coinage was produced or used in North Africa. Instead, the majority derive from Carthage's holdings in Sardinia and western Sicily.
![On a Tetradrachma of Athens, struck c. 490 BC, the head of Athena, (left), is regarded as the obverse because of its larger scale and because it is a portrait head; the entire owl is depicted in a smaller scale on the reverse. Legend: AThE[NAI]O[N], ie of Athenians. Tetradrachma fran Aten (omkr 490 fKr, ur Nordisk familjebok).png](http://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Tetradrachma_fr%C3%A5n_Aten_%28omkr_490_fKr%2C_ur_Nordisk_familjebok%29.png/220px-Tetradrachma_fr%C3%A5n_Aten_%28omkr_490_fKr%2C_ur_Nordisk_familjebok%29.png)
![Solidus of Justinian II after 705. Christ is on the obverse (left), the emperor on the reverse. Legend: D[OMI]N[US] IHS[US] CH[RI]S[TOS] REX RAGNANTIUM / D[OMI]N[US] IUSTINIANUS MULTUS A[NNI]. Solidus-Justinian II-Christ b-sb1413.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Solidus-Justinian_II-Christ_b-sb1413.jpg/220px-Solidus-Justinian_II-Christ_b-sb1413.jpg)
