It depends on the nation. The smallest circulating US coin is a dime, but for other countries it really depends. But the smallest historic coin that the US has minted for circulation is the silver three cent piece.
The physically smallest coin produced by the Royal Mint is the <a href="http://lovecoins.co.uk/smallest-uk-coin-ever-royal-mint-britannia/">Britannia fortieth ounce coin</a> which measures 8mm in diameter.
The physically smallest coin produced for circulation in England by the Royal Mint was the round silver Threepence at 16mm.
The current physically smallest coin produced for circulation by the Royal Mint is the Five Pence coin from 1990 at 18mm.
The smallest denomination coin produced for circulation by the Royal Mint was the Quarter-Farthing coin, but it was only for circulation in some of Britain's colonial outposts, notably Ceylon (Sri Lanka).
The current smallest denomination coin produced for circulation by the Royal Mint is the Penny.
1p.
The smallest Euro note is €5. Below that is the €2 coin and the €1 coin.
Because there is no other coin that is smaller.
the smallest value of a coin is a penny.
Lepta
cost of silver
The smallest word in the English dictornary is in fact two words in the English dictornary; I, and A.
The smallest French coin is the 1 centime coin, which is worth 0.01 euro.
"Coin" in English is moneta in Italian.
From 1933 until 1940, the smallest denomination New Zealand coin in circulation was the Threepence. From 1940 until 1967, the smallest denomination New Zealand coin in circulation was the Halfpenny. All other predecimal coins circulating in New Zealand prior to decimalisation were mostly British with some Australian coins. Some of the British coins may have included the Farthing and maybe even some fractional Farthings. From the introduction of decimal currency in 1967, the smallest denomination New Zealand coin was the 1 cent coin until the 1 and 2 cent coins were withdrawn and demonetised in 1990. From 1990, the smallest denomination New Zealand coin was the 5 cent coin until it withdrawn and demonetised in 2006. Since 2006, the smallest denomination New Zealand coin is the 10 cent coin.
5 centimes
the English £1 coin
The smallest US coin released into circulation was in 1849 and was the $1 gold coin measuring just 13mm in diameter. The second smallest coin was the silver 3 cent piece released in 1852 and measuing 14mm in diameter. By comparison the Roosevelt Dime is 17.9mm in diameter.