Fair Dice
A die (plural "dice") is really any solid object with markings on each face that can be used to create a random number. Very useful when playing games of chance!
Fair Dice
In mathematics we say "fair dice" when we mean that there is an equally likely chance of landing on any face.
Most people would think of these little cubes when you mention "dice" ... 

... but all of the Platonic Solids can make fair dice!  
Because the faces are all the same, there is an equal chance of landing on any face.
So, using the platonic solids you can have dice with 4, 6, 8, 12 or 20 faces!
But with some imagination you can actually make fair dice with any number of faces you want.
How about these interesting dice?
Or this 10sided one. 
Or this 20sided Roman die that is 1,800 years old: 