Delightful rabbit hole #23,582, courtesy of Hyperallergic: the oracle bone!
In ancient China people would carve questions on animal bones, then heat them up until they cracked, and interpret the cracks. This is a form of pyromancy, which (via Wikipedia) also includes:
Alomancy, divination by salt, one type of which involves casting salt into a fire
Botanomancy, divination by burning plants
Capnomancy, divination by smoke; light, thin smoke that rose straight up was a good omen; otherwise, a bad one.
Causinomancy, divination by burning (non-specific as to the object burned)
Daphnomancy (also, Empyromancy), divination by burning laurel leaves
Osteomancy, divination using bones, one type of which involves heating to produce cracks
Scapulimancy, divination by scapulae; in Asia and North America, this was done pyromantically.
Sideromancy, divination by burning straw with an iron.