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Four-sided die
Four-sided dice, abbreviated d4,〔 are often used in tabletop role-playing games to obtain random integers in the range 1–4. Two forms exist of this die: a tetrahedron (pyramid shape) with four equilateral triangle-shaped faces, and an elongated barrel die with four faces. The former type does not roll well and is thus usually thrown into the air or shaken in a box.
==Historical==
Four-sided dice were among the gambling and divination tools used by early man who carved them from nuts, wood, stone, ivory and bone. Six-sided dice were invented later but four-sided dice continued to be popular in Asia. In Ancient Rome, elongated four-sided dice were called ''tali'' while the six-sided cubic dice were ''tesserae''. In India and Tibet, three four-sided barrel dice were rolled sequentially as an oracle, to produce 1 of 64 possible outcomes. The ancient Jewish dreidel is a four-sided barrel die with one end changed into a handle, to allow it to be spun like a top.
The ancient Egyptian Royal Game of Ur uses eight four-sided pyramid-shaped dice made out of rock, half of them colored white, and half black. The Scandinavian game daldøs uses a four-sided barrel die.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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