Astragalomancy

Astragalomancy, also known as astragyromancy, is a form of divination that uses dice specially marked with letters and numbers.

Originally, as with dice games, the "dice" were quadruped knucklebones or other small bones. Marked astragali of sheep and goats are common at Mediterranean and Near Eastern archaeological sites, particularly at funeral and religious locations. For example, marked astragali have been found near the altar of Aphrodite Ourania in Athens, Greece, suggesting astragalomancy was performed near the altar after about 500 BC.