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There are infinitely many non-similar shapes of icosahedra, some of them being more symmetrical than others. The best known is the ( convex , non- stellated ) regular icosahedron —one of the Platonic solids —whose faces are 20 equilateral triangles .
The highest symmetry irregular icosagons are d20, an isogonal icosagon constructed by ten mirrors which can alternate long and short edges, and p20, an isotoxal icosagon, constructed with equal edge lengths, but vertices alternating two different internal angles.
In several roleplaying games, such as Dungeons & Dragons, the twenty-sided die (labeled as d20) is commonly used in determining success or failure of an action. It may be numbered from "0" to "9" twice, in which form it usually serves as a ten-sided die ( d10 ); most modern versions are labeled from "1" to "20". [ 24 ]
Dice are often sold in sets, matching in color, of six different shapes. Five of the dice are shaped like the Platonic solids , whose faces are regular polygons . Aside from the cube, the other four Platonic solids have 4, 8, 12, and 20 faces, allowing for those number ranges to be generated.
d20, a polyhedral die commonly used in role-playing games; d20 System, a role-playing game system published by Wizards of the Coast; Arriflex D-20, a film-style digital high definition movie camera; D-20, a version of the Roland D-50 synthesizer; Dimension 20, a tabletop role-playing game show made by CollegeHumor/Dropout
This is a list of two-dimensional geometric shapes in Euclidean and other geometries. For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes.
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 dn where n is the number of faces (d8, d20, etc.); see dice notation for more details.
Table of Shapes Section Sub-Section Sup-Section Name Algebraic Curves ¿ Curves ¿ Curves: Cubic Plane Curve: Quartic Plane Curve: Rational Curves: Degree 2: Conic Section(s) Unit Circle: Unit Hyperbola: Degree 3: Folium of Descartes: Cissoid of Diocles: Conchoid of de Sluze: Right Strophoid: Semicubical Parabola: Serpentine Curve: Trident ...