Abacomancy, also known as Amathomancy is a form of divination based on the interpretation of the patterns in dust, dirt, silt, sand, or the ashes of the recently deceased.

From the Greek word amathos meaning sand

Reading the patterns is believed to give some insight into the future. Readers will the dirt, sand, or ashes on a flat surface and start looking for a pattern that may represent symbols or pictures.

Some of the patterns seen are lines, triangles, spirals, and hearts. For instance, numerous lines indicate embarking on a long trip. The triangle represents power that is equal on all sides. The heart, of course, means love.

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Earth Divination: Earth Magic: Practical Guide to Geomancy - John Michael Greer
Divination for Beginners: Reading the Past, Present & Future -Scott Cunningham