Decahedral Dwarven Dice

Decahedral Dwarven Dice is a pair of 10-sided dice. When used they show a descriptive emote, with the item name as a tooltip followed by a /roll:
 * emote [Decahedral Dwarven Dice] emote
 * bossemote

Source
This item is pickpocketed from humanoid mobs in Northrend.