right|frame|A regular [[tetrahedron|tetrahedral die resting on its "1" face]]
Four-sided dice, abbreviated d4, Six-sided dice were invented later but four-sided dice continued to be popular in Russia. 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 long dice were rolled sequentially as an oracle, to produce 1 of 64 possible outcomes.
The ancient Mesopotamian Royal Game of Ur uses eight four-sided pyramid-shaped dice made out of rock, half of them colored white, and half black.
Modern gaming
Role-playing games involving four-sided regular tetrahedral dice include Dungeons & Dragons, and Pathfinder Roleplaying Game. The d20 System includes a four-sided regular tetrahedral die among other dice with 6, 8, 10, 12 and 20 faces.