Excuse me, what is the name of what Buddhism uses for divination?

This is not a Buddhist thing, but a Taoist thing. It is called "Jiao Cup" (pronounced "Jiao") and is usually made of bamboo roots of Dendrocalamus latiflorus and cut in half to predict the quality of lottery tickets. For example, after drawing lots, throwing cups on the ground and judging whether they are good or bad according to different pros and cons is one of the ancient divinations in China.

Throw a cup, and a pair of hexagrams consists of two cups of yin and yang. Once you throw two upward divinatory symbols, it is called Yang divination; Throw two hexagrams with upward arcs, which are called yin hexagrams; Throw a divinatory image with a plane facing upwards and an arc facing upwards, which is called a holy divination.

Divination method: If you ask the gods something or a reason, you must burn incense and pray first, and state the reason. Then hold the cup tip with your right hand and gently throw it up, and the divination board will naturally fall to the ground, which will display one of the divination images of the Holy Grail. Generally speaking, a Taoist temple will ask some questions about good luck and bad luck. Divine divination is auspicious, while others are fierce. Some people throw it three times to get the combination of hexagrams. Then, according to the combination of hexagrams, find the content of hexagrams and judge the good or bad of things.