What is the name of the half moon placed in front of Guanyin to worship God?

Cup-shaped divination tools are generally made of two clam shells or bamboo chips or sawdust similar to clam shells, and thrown on the ground to see their pitch, so as to predict good or bad luck, such as "holding ~ ~ to guide me to vote, the cloud is the most auspicious and the rest are difficult to agree with." Cup divination is also an ancient divination. The so-called mussels are two mussel shells. The shell is like a cup, so it is called a cup. Throw two mussels into the air and watch them throw the ball to get rid of the blame. Generally, it is good to raise one side and combine with the other. Later, mussel shells were not used exclusively, and some were made of bamboo and wood.