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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. The name comes from Ancient Greek εἴκοσι (eíkosi) ' twenty ' and ἕδρα (hédra) ' seat '. The plural can be either "icosahedra" (/-d r ə /) or "icosahedrons".
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.
Various shapes such as two-sided or four-sided dice are documented in archaeological findings; for example, from Ancient Egypt and the Middle East. 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.
There are generic geometric names for the most common polyhedra. The 5 Platonic solids are called a tetrahedron , hexahedron , octahedron , dodecahedron and icosahedron with 4, 6, 8, 12, and 20 sides respectively.
1d6×5 or 5×d6 means "roll one 6-sided die, and multiply the result by 5." 3d6×10+3 means "roll three 6-sided dice, add them together, multiply the result by 10, and then add 3." Multiplication can also mean repeating throws of similar setup (usually represented by the letter "x", rather than the multiplication symbol):
A result of double-zero is commonly interpreted as 100. Some ten-sided dice (often called 'Percentile Dice') are sold in sets of two where one is numbered from 0 to 9 and the other from 00 to 90 in increments of 10, thus making it impossible to misinterpret which one is the tens and which the units die. Ten-sided dice may also be marked 1 to 10 ...
Two clusters of faces of the bilunabirotunda, the lunes (each lune featuring two triangles adjacent to opposite sides of one square), can be aligned with a congruent patch of faces on the rhombicosidodecahedron. If two bilunabirotundae are aligned this way on opposite sides of the rhombicosidodecahedron, then a cube can be put between the ...
Since 2016, the Dice Lab has used the disdyakis triacontahedron to mass-market an injection-moulded 120-sided die. [5] It is claimed that 120 is the largest possible number of faces on a fair die, aside from infinite families (such as right regular prisms , bipyramids , and trapezohedra ) that would be impractical in reality due to the tendency ...
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