I've seen some version of this article various times over the last 10 years. They've found these in Rome, in Greece, and in Egypt. The witty fellow who wrote this article likes to think they were for determining hit dice for sphinxes. Who knows? This could have been a gaming device or it could have had mystical functions, such as an aid in prophecy. In an upcoming superhero tabletop rpg our group is running soon, one of the characters has obtained an ancient die, and can use it to summon creatures.