Coinage shapes

The *Tenpō Tsūhō*, a Japanese coin from the 19th-century.

Although the vast majority of coins are round, coins are made in a variety of other shapes, including squares, diamonds, hexagons, heptagons, octagons, decagons, and dodecagons. They have also been struck with scalloped (wavy) edges, and with holes in the middle. Coins in the shape of polygons often have rounded edges or are Reuleaux polygons.

This article focuses on circulating coins; a number of non-circulating commemorative coins have been made in special shapes, including guitars, pyramids, and maps.^[1]

Triangular

The Cook Islands have a circulating 2 dollar triangular coin with rounded corners ^[2].

Squares and diamonds

Indo-Greek coins were often square. Aruba has a large circulating square 50 cents coin ^[3].

Many countries have struck square coins with rounded corners. Some of these, such as the Netherlands zinc 5 cent coin of World War II (1941-1943) ^[4] and the Bangladesh 5 poisha coin (1977-1994) ^[5] are oriented as a square, while others, such as the Netherlands 5 cents (1913-1940) ^[6], the Netherlands Antilles 50 cent, the Bangladesh 5 poisha (1973-1974) ^[7] and the 1981 Jersey 1 pound coin ^[8], are oriented as a diamond. Ceylon (the current Sri Lanka) issued its first square coin in 1909, followed by several others. ^[9] India has various square coins as well, like denominated 1/2 and 2 anna coins ^[10], as well as 1 and 5 paisa coins. ^[11]

Siege money, such as Klippe coins or the siege money of Newark, was often in the shape of a lozenge (rhombus).

Pentagonal

The Mutawakkilite Kingdom of Yemen introduced pentagonal 1⁄16 and 1⁄8 rial coins in 1948. ^[12] ^[13] In 2014 Transnistria was the next country to issue a circulating pentagonal 5 rubles hard plastic coin. ^[14]

Hexagonal

The Belgian Congo had a hexagonal 2 franc coin ^[15], as did the Kingdom of Egypt (2 piastres, also known as 2 qirsh) ^[16]. India used to have 3 paise and 20 paise coins that were hexagonal with rounded corners. ^[17] ^[18] The Burma (25 pyas) is scalloped hexagonal. ^[19]

File:UAE 50 Fil Coin (Front).jpg

The 50 fils coin from the UAE is a Reuleaux heptagon.

Heptagonal

The Madagascar 10 ariary coin is seven-sided. ^[20] The British twenty pence and fifty pence coins are heptagonal Reuleaux polygons ^[21] ^[22], as is the United Arab Emirates 50 fils coin, the Barbados one dollar coin ^[23], and several coins from Botswana ^[24]. Many countries in the Commonwealth of Nations have issued heptagonal coins. Reuleaux polygons have constant width, which means the currency detectors in coin-operated machines do not need an extra mechanism to detect shape.^[25]

Octagonal

The old Chile 1 peso coin is eight-sided, as well as the 5 pesos coin. ^[26] So was the old circulating Malta 25 cent coin commemorating Malta's first anniversary of the republic ^[27] and some California gold coins Some other countries that have issued circulating octagonal coins are the Lebanon ^[28] and Sierra Leone ^[29].

Nonagonal

Nonagonal coins are very rare, the first country to issue a circulating nine-sided coin was Thailand with a 1972 5 baht coin ^[30], followed in 1976 by Tuvalu with a 50 cent coin ^[31].

Decagonal

Hong Kong issued a ten-sided 5 dollar coin from 1976 to 1979 ^[32], while the Philippines issued ten-sided two piso (peso) coins from 1983 to 1990. ^[33] Some other countries that have issued ten-sided circulation coins are Chile ^[34], the Dominican Republic ^[35], Jamaica ^[36] and Madagascar ^[37].

Hendecagonal

The old Indian 2-rupee coin was eleven-sided ^[38], while the Canadian one dollar coin is an eleven-sided Reuleaux polygon ^[39]. Also Madagascar has issued some circulating eleven-sided coins. ^[40]

Dodecagonal

Many countries have struck twelve-sided coins, mostly countries belonging to the Commonwealth of Nations. Several of these are 3 pence (or quarter shilling) coins from the pre-decimal pound. ^[41] ^[42] Coins currently circulating include the British one pound coin ^[43], 50 cent coins from Australia ^[44], Fiji ^[45] and the Solomon Islands ^[46], the Tongan 50 seniti coin ^[47] and the circulating commemorative Croatian 25 kuna coins ^[48].

Tridecagonal

In 1993, the Czech Republic was the first country to issue a 13 sided 20 koruna coin ^[49]. In 2013, Tunisia followed with a 13-sided 200 millièmes coin ^[50].

Pentadecagonal

A 5 dirham commemorative coin from the UAE in 1981 had 15 sides, commemorating the 15th century of Hejira ^[51].

Scalloped

Many countries have coins with scalloped (wavy) edges. These usually have twelve bumps (e.g. the Vanuatu 100 vatu or the Hong Kong 20 cents), but can have other numbers such as eight (the eSwatini 10 cents or the Ang Bagong Lipunan Philippine five centavo coin) or sixteen (the Libya 50 dirhams).

Holed

Often a round coin will have a central hole. In some countries this was to allow them to be strung together,^[52] while other reasons include difficulty of counterfeiting and ability for visually impaired people to distinguish them from other coins.^[53]

Chinese cash coins had a square hole, while many modern coins have a round hole. Examples include the Japan 5 yen coin and the Denmark 1 krone coin.

Other shapes

Rectangles: In the Edo period Japan issued several circulating silver and gold rectangular coins. ^[54] ^[55], as well as a copper clad lead issue with a hole. ^[56]

Near oval: Japan also issued various near oval coins in the Edo period ^[57] ^[58] ^[59].

Half circle: for Barbados Spanish coins were cut in half, it is hard to detect originals though, many forgeries exist. ^[60]

Additional shapes among non-circulating coins

Triangular: Bermuda has some special issue triangular coins from 1997 onward with curved edges. ^[61] The Isle of Man has some triangular special issue coins where the triangle is not regular (the angles are not all 60 degrees). ^[62]

Octagonal: The U.S. Panama–Pacific commemorative 50 dollar coins of 1915 is shaped like a true octagon. ^[63]

Tetradecagonal: In 1976, Malaysia was the first country to issue 14-sided coins, the non-circulating 10 (silver) and 200 (gold) ringgit ^[64]. Australia started to issue a series of non-circulating 14-sided 50 cents coins dedicated to the Chinese zodiac in 2012 ^[65].

Rectangular: Jersey ^[66] and Fiji ^[67] have issued non-circulating rectangular coins.

Oval: Fiji and Poland have issued some non-circulating oval coins. ^[68] ^[69]

Quarter circle: Poland has issued a 10 złotych coin in the shape of a quarter circle. ^[70]

Spheres: Niue issued the first official (non-circulating) shperical coin with a face value of 7 New Zealand dollars. ^[71] Several other countries followed soon with spherical coins, like Poland and Barbados. A 2008-2014 1 dollar sphere issue from Somalia is considered a fantasy coin, it was not officially issued by Somalia. ^[72]

Yin Yang: Fiji has issued some Yin Yang shaped coins. ^[73]

Arc (section of a circle with a hole): China started to issue a series of arc-shaped coins in the year 2000. ^[74]

Heart: Several countries have issued non-circulating heart shaped coins, like China, Cook Islands and Poland. ^[75]

Maps: Nauru has issued some non-circulating map shaped coins. ^[76] ^[77] Australia also has issued some non-circulating map shaped coins (1 dollar coins in the shape of the map of Australia). ^[78]

Coca Cola cap: Fiji has issued some non-circulating coins shaped like the cap of a Coca Cola bottle. ^[79]

Cannabis leaf: Benin issued a non-circulating 100 CFA francs coin shaped like a cannabis leaf in 2011. ^[80]

Masks: Fiji issued a Ironman Mask and a Spiderman Mask coin in 2019, both non-circulating. ^[81] ^[82]

References

External links

Unusual / odd coins around the world

[1] Plautz, Jason (13 May 2013). "11 Unusually Shaped Coins". Mental Floss. Retrieved 1 July 2018.

[2] ttps://en.numista.com/catalogue/pieces4436.html

[3] ttps://en.numista.com/catalogue/pieces6840.html

[4] ttps://en.numista.com/catalogue/pieces1150.html

[5] ttps://en.numista.com/catalogue/pieces1978.html

[6] ttps://en.numista.com/catalogue/pieces3370.html

[7] ttps://en.numista.com/catalogue/pieces6765.html

[8] ttps://en.numista.com/catalogue/pieces14682.html

[9] ttps://en.numista.com/catalogue/pieces12117.html

[10] ttps://en.numista.com/catalogue/pieces1612.html

[11] ttps://en.numista.com/catalogue/pieces7179.html

[12] ttps://en.numista.com/catalogue/pieces19672.html

[13] ttps://en.numista.com/catalogue/pieces19674.html

[14] ttps://en.numista.com/catalogue/pieces64483.html

[15] ttps://en.numista.com/catalogue/pieces7011.html

[16] ttps://en.numista.com/catalogue/pieces8677.html

[17] ttps://en.numista.com/catalogue/pieces1847.html

[18] ttps://en.numista.com/catalogue/pieces1635.html

[19] ttps://en.numista.com/catalogue/pieces5612.html

[20] ttps://en.numista.com/catalogue/pieces8462.html

[21] ttps://en.numista.com/catalogue/pieces865.html

[22] ttps://en.numista.com/catalogue/pieces880.html

[23] ttps://en.numista.com/catalogue/pieces924.html

[24] ttps://en.numista.com/catalogue/pieces5410.html

[25] Houston, Kevin (8 July 2011). "Curves of constant width – The 50p story". Retrieved 1 July 2018.

[26] ttps://en.numista.com/catalogue/pieces1866.html

[27] ttps://en.numista.com/catalogue/pieces4170.html

[28] ttps://en.numista.com/catalogue/pieces5222.html

[29] ttps://en.numista.com/catalogue/pieces10761.html

[30] ttps://en.numista.com/catalogue/pieces9431.html

[31] ttps://en.numista.com/catalogue/pieces12142.html

[32] ttps://en.numista.com/catalogue/pieces3992.html

[33] ttps://en.numista.com/catalogue/pieces3750.html

[34] ttps://en.numista.com/catalogue/pieces2834.html

[35] ttps://en.numista.com/catalogue/pieces20878.html

[36] ttps://en.numista.com/catalogue/pieces7457.html

[37] ttps://en.numista.com/catalogue/pieces10559.html

[38] ttps://en.numista.com/catalogue/pieces5474.html

[39] ttps://en.numista.com/catalogue/pieces465.html

[40] ttps://en.numista.com/catalogue/pieces1856.html

[41] ttps://en.numista.com/catalogue/pieces12570.html

[42] ttps://en.numista.com/catalogue/pieces4936.html

[43] ttps://en.numista.com/catalogue/pieces100658.html

[44] ttps://en.numista.com/catalogue/pieces904.html

[45] ttps://en.numista.com/catalogue/pieces4152.html

[46] ttps://en.numista.com/catalogue/pieces3487.html

[47] ttps://en.numista.com/catalogue/pieces22098.html

[48] ttps://en.numista.com/catalogue/pieces11963.html

[49] ttps://en.numista.com/catalogue/pieces2148.html

[50] ttps://en.numista.com/catalogue/pieces53900.html

[51] ttps://en.numista.com/catalogue/pieces12137.html

[52] "Why Do Some Ancient Coins Have Holes In Them?". Retrieved 3 July 2018.

[53] Gordenker, Alice (20 June 2006). "5 yen and 50 yen coins". The Japan Times. Retrieved 3 July 2018.

[54] ttps://en.numista.com/catalogue/pieces10811.html

[55] ttps://en.numista.com/catalogue/pieces16677.html

[56] ttps://en.numista.com/catalogue/pieces116959.html

[57] ttps://en.numista.com/catalogue/pieces175770.html

[58] ttps://en.numista.com/catalogue/pieces11614.html

[59] ttps://en.numista.com/catalogue/pieces22799.html

[60] ttps://en.numista.com/catalogue/pieces117882.html

[61] ttps://en.numista.com/catalogue/pieces18298.html

[62] ttps://en.numista.com/catalogue/pieces93324.html

[63] ttps://en.numista.com/catalogue/pieces24935.html

[64] ttps://en.numista.com/catalogue/pieces17787.html

[65] ttps://en.numista.com/catalogue/pieces42984.html

[66] ttps://en.numista.com/catalogue/pieces198999.html

[67] ttps://en.numista.com/catalogue/pieces156499.html

[68] ttps://en.numista.com/catalogue/pieces82769.html

[69] ttps://en.numista.com/catalogue/pieces28822.html

[70] ttps://en.numista.com/catalogue/pieces51893.html

[71] ttps://en.numista.com/catalogue/pieces183881.html

[72] ttps://en.numista.com/catalogue/pieces41923.html

[73] ttps://en.numista.com/catalogue/pieces107264.html

[74] ttps://en.numista.com/catalogue/pieces164381.html

[75] ttps://en.numista.com/catalogue/pieces30366.html

[76] ttps://en.numista.com/catalogue/pieces54805.html

[77] ttps://en.numista.com/catalogue/pieces54803.html

[78] ttps://en.numista.com/catalogue/pieces46215.html

[79] ttps://en.numista.com/catalogue/pieces131407.html

[80] ttps://en.numista.com/catalogue/pieces24709.html

[81] ttps://en.numista.com/catalogue/pieces185902.html

[82] ttps://en.numista.com/catalogue/pieces185027.html

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