+**20d** is a shorthand notation in [Tabletop Games](/wiki/tabletop-games) signifying a roll of a twenty-sided [Dice](/wiki/dice). This single die roll often determines the success or failure of an action, introducing an element of chance to the narrative.
+## See also
+- [D20 System](/wiki/d20-system)
+- [Randomness](/wiki/randomness)
+- [Critical Hit](/wiki/critical-hit)
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