12-sided and 20-sided dice are disclosed which have a suit symbol and a value symbol on each surface representing one of the various playing cards in a standard 52 card playing deck. The 12-sided die will carry 3 different value symbols for each of the 4 suits and, accordingly, will depict 12 different...http://www.google.co.uk/patents/US5145175?utm_source=gb-gplus-sharePatent US5145175 - Symmetrical dice with card indicia
