A 1st-2nd Century AD; a 20 sided 'Roman Rock Crystal Dice' (icosahedron), from Wroxeter, Shropshire, England.
This kind of dice was intended to be thrown, and to give a random result or possibly used in fortune telling, Greek letter on each face may have corresponded to a reference in a divination manual. Alternatively, it may have been used for an unknown game. Archeologists believe that they were also used in conjunction with divination handbooks.
Louvre Museum