And I think this is the one key reason why the d20 is seen as almost holy - special enough to be worn prominently on a t-shirt. In most games that use a d20 to determine results, it’s not used for anything else. When you pick up a d20, you know something important is going down. The game is at a tipping point. This one die you hold in your hand holds the key to glorious victory or soul-crushing defeat.