The regular icosahedron is a convex polyhedron that can be constructed from a pentagonal antiprism by attaching two pentagonal pyramids with regular faces to each of its pentagonal faces, or by puttin
Icosahedron
A twenty-sided die from Ptolemaic Egypt, inscribed with Greek letters on the faces
The Scattergories twenty-sided die, excluding the six letters Q, U, V, X, Y, and Z
The radiolarian Circogonia icosahedra
A die is a small, throwable object with marked sides that can rest in multiple positions. Dice are used for generating random values, commonly as part of tabletop games, including dice games, board ga
Regular icosahedron
…was made out of gold and with numbers written on each face. 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…
Four traditional dice showing all six different sides
Terracotta die from Mohenjo-daro, c. 2600-1900 BCE
Knucklebones die, made of soapstone