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d4 (plural d4s)
- In role-playing games, a die with four sides.
1979, Gary Gygax, Advanced Dungeons & Dragons Dungeon Master's Guide, Lake Geneva, WI: TSR Games, page 10:
- The d4 can be used to generate 25% incremental probabilities, random numbers from 1 to 4, with +1 it generates a linear 2-5, etc.