Top 10 Oddest Coin Shapes that Were Actually Used

Metal_Treasure
Usually coins are round and this is the norm in modern coinage - the reason is practical: round coins are less prone to wear and are most easily mass-produced. But there are some interesting exceptions.

The Top Ten

1 Shape of the European Union Shape of the European Union

It was issued in 2002 to celebrate the introduction of the euro. But if you thought it was issued by Brussels, you were wrong. It wasn't even issued by a European country. Keep on reading...
It was issued by Nauru, an island republic located in the Pacific Ocean, northeast of Australia!
It was a $10 coin (I guess Australian dollar). Not Euro... But a coin of 1 Euro was depicted on it...
This is so odd from any viewpoint but at least we can't deny Nauru's sense of international solidarity. - Metal_Treasure

2 Guitar-shaped Guitar-shaped

It's a 2004 commemorative dollar coin issued by Somali Republic, to mark the 50th anniversary of rock and roll music and the Stratocaster guitar. - Metal_Treasure

The fact that it was issued by Somalia makes it even weirder. It seems that they have nothing better nothing to do than issuing guitar coins and fighting each other. - Bolshoy_Brat

I didn't even know there were coins that have different colors aside from bronze, silver, and gold. - TheFourthWorld

Lol nice - EliHbk

3 Shape of the conjoined maps of Australia and Zambia Shape of the conjoined maps of Australia and Zambia

This is one of the most bizarre shaped coins ever. It was issued by Zambia to commemorate the 2000 Sydney Olympics.
On that weird map Zambia (Africa) looks attached to Northern Australia... - Metal_Treasure

4 Multi piece Multi piece

This one is actually kind of cool. - KKwing

In the image you see 4 pieces that fit together to form a flag-shaped coin. A flag-shaped coin is also odd. Besides, the shape of these 4 pieces is unusual, too. So this coin has 3 odd elements.
It was Issued by Poland in 2012 for the occasion of the Euro 2012 Football championship, where Poland and Ukraine were host countries. - Metal_Treasure

5 Fan-shaped Fan-shaped

Shaped like the Steven Universe fans? Oh no - TwilightKitsune

It was issued by Poland in 2005 - Metal_Treasure

6 Triangular Triangular

Used in Cook Islands, Bermuda (referring to Bermuda Triangle? ) - Metal_Treasure

Illuminati Confirmed. - AlphaQ

7 Coins with a Hole Coins with a Hole

I didn't know this wasn't used in other countries. lol
I honestly don't find this odd since we use these coins in where I live. - TheFourthWorld

The holes are usually round, square or rectangular.
These coins with a hole look like bagels! - Metal_Treasure

8 Rectangular Rectangular

Rectangular coins are less common than square-shaped and diamond-shaped coins.

Rectangular coins have been issued in Tonga and Aruba - Metal_Treasure

9 Diamond-shaped Diamond-shaped

Some of the countries that have released circulating diamond-shaped coins include India, the Netherlands, Bahamas, Bhutan, Myanmar, Oman, Pakistan - Metal_Treasure

10 Pentagonal Pentagonal

Pentagonal-shaped coins have 5 sides. Yemen used pentagonal coins in the 1940s and 1950s (the image shows one of them). - Metal_Treasure

The Contenders

11 Square Square

Square coins have been issued by India, Ceylon, The Netherlands, Poland, Swaziland - Metal_Treasure

12 Scalloped edges Scalloped edges
13 Hexagonal Hexagonal

A hexagonal-shaped coin is a 6-sided coin.
The image shows an Egyptian silver coin - Metal_Treasure

14 12-sided 12-sided

I didn't put it very high because this shape is already very close to the norm - the round shape. - Metal_Treasure

I really like this one.

15 Heptagonal

I'm a Brit and yeah it's slightly weird but I like it's uniqueness. - LemonComputer

The fifty pence piece in the UK is one such example. - PositronWildhawk

16 Oval Oval

The image shows old Japanese coins but oval coins are still used in some modern countries. - Metal_Treasure

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