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The dodecagon coin was announced in the UK's 2014 budget and has been billed by the Royal Mint as "the most secure coin in the world".

A hexagon has six sides, an octagon eight and a dodecagon 12.It's 1.05km.

In the Arabic pattern on page 276 the dodecagon appears as the basis, and the remarkable powers of the Arab designer are shown in the use of symmetry without employing regular figures.

The perimeter of the dodecagon to be inscribed in a circle is greater than the perimeter of the circle.

Of nouns in on, derived from Greek, the greater part always form the plural regularly; as, etymons, gnomons, ichneumons, myrmidons, phlegmons, trigons, tetragons, pentagons, hexagons, heptagons, octagons, enneagons, decagons, hendecagons, dodecagons, polygons.