page_title: Coinage shapes
section_title: Heptagonal
hierarchical_section_title: Coinage shapes / Heptagonal
caption_attribution_description: English: Egypt 1933, 2.5 Milliemes, copper-nickel, octagonal
context_page_description: 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 edges, and with holes in the middle. Coins in the shape of polygons often have rounded edges or are Reuleaux polygons.
  There is a list with more unusual shapes of non-circulating commemorative coins at the end of this page, that all have been issued officially by various countries.
context_section_description: The Madagascar 10 ariary coin is seven-sided.  The British twenty pence and fifty pence coins are heptagonal Reuleaux polygons  , as is the United Arab Emirates 50 fils coin, the Barbados one dollar coin , and several coins from Botswana . 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.
caption: Octaganal 2​1⁄2 milliemes coin from the Kingdom of Egypt.
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