The Metropolitan Museum of Art officially calls it a game piece. However, my guess is that since both the Platonic solids and the alphabet had mystical significance by the 2nd century AD, it was used for divination.
"It is a matter of grave importance that Fairy tales should be respected.... Whosoever alters them to suit his own opinions, whatever they are, is guilty, to our thinking, of an act of presumption, and appropriates to himself what does not belong to him." -- Charles Dickens
You roll a natural omega, doing critical damage to the attacking sphinx.
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Umm, oops, it's natural one. Please don't feed me to crocodiles!
I have a weakness for awesome dice, what can i say.