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Convex regular icosahedron A tensegrity icosahedron. In geometry, an icosahedron (/ ˌ aɪ k ɒ s ə ˈ h iː d r ən,-k ə-,-k oʊ-/ or / aɪ ˌ k ɒ s ə ˈ h iː d r ən / [1]) is a polyhedron with 20 faces.
In geometry, an icosagon or 20-gon is a twenty-sided polygon. The sum of any icosagon's interior angles is 3240 degrees. ... including up to 20-fold rotations and ...
The d20 System is a role-playing game system published in 2000 by Wizards of the Coast, originally developed for the 3rd edition of Dungeons & Dragons. [1] The system is named after the 20-sided dice which are central to the core mechanics of many actions in the game.
The d1000 (using three 10-sided dice) is occasionally also seen, although it is more common in wargames than role-playing games. Before the introduction of ten-sided dice around 1980, twenty-sided dice were commonly manufactured with two copies of each digit 0 to 9 for use as percentile dice.
Platonic solids are often used to make dice, because dice of these shapes can be made fair. 6-sided dice are very common, but the other numbers are commonly used in role-playing games. Such dice are commonly referred to as d n where n is the number of faces (d8, d20, etc.); see dice notation for more details.
While the cubical six-sided die became the most common type in many parts of the world, other shapes were always known, like 20-sided dice in Ptolemaic and Roman times. The modern tradition of using sets of polyhedral dice started around the end of the 1960s when non-cubical dice became popular among players of wargames , [ 29 ] and since have ...
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English: A twenty-sided die (d20) as used in wargaming and roleplaying, most famously in Dungeons & Dragons. Date: 6 November 2010, 04:15:17: Source:
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