Coin
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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. The faces of coins or medals are sometimes called the obverse and the reverse, referring to the front and back sides, respectively. 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.
A selection of metal coins
An oxhide ingot from Crete. Late Bronze Age metal ingots were given standard shapes, such as the shape of an "ox-hide", suggesting that they represented standardized values.
Coin of Alyattes of Lydia, c. 620/10–564/53 BC
The earliest inscribed coinage: electrum coin of Phanes from Ephesus, 625–600 BC. Obverse: Stag grazing right, ΦΑΝΕΩΣ (retrograde). Reverse: Two incuse punches, each with raised intersecting lines.
Legal tender
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Legal tender is a form of money that courts of law are required to recognize as satisfactory payment for any monetary debt. Each jurisdiction determines what is legal tender, but essentially it is anything which when offered ("tendered") in payment of a debt extinguishes the debt. There is no obligation on the creditor to accept the tendered payment, but the act of tendering the payment in legal tender discharges the debt.
Detail of the obverse of a Series 1950 United States ten-dollar bill, showing the phrase "This note is legal tender for all debts, public and private, and is redeemable in lawful money at the United States Treasury, or at any Federal Reserve Bank." This phrase was subsequently shortened in later issues to "This note is legal tender for all debts, public and private."
Indian rupees were stamped with Government of Pakistan to be used as legal tenders in the new state of Pakistan in 1947.