Damage Dice Rolls
You may notice that weapon damage is represented as a dice roll. For example, 1d6 means a single 6 sided dice. The weapon damage from a 1d6 weapon is randomly generated to be any number between 1 and 6 as a result. A 3d10 weapon means 3 10 sided dice will be rolled which would mean the weapon has a minimum damage of 3 and a maximum damage of 30.
Rolls can also be simulated using /roll nDn, where n are the two numbers.