The creative folks behind this Kickstarter have created high quality "dice rings" made out of etched stainless steel. Each ring has one or more independently spinning outer ring that is fitted into a grove on the inner ring. Instead of "2d6" to represent 2 six sided dice, they note each die with and "r" so if you wanted to spin two six siders it would be "2r6."
Pretty clever. I can't say I would necessarily use them myself but I applaud the effort.