The tiger symbol, also known as the military symbol, was named because it was shaped like a crouching tiger. It was a certificate used by ancient emperors to grant military power to his subjects and mobilize the army. The roller can be divided into two halves. When fighting, the left half is given to the general who leads the troops, and the right half is kept by the monarch. When the army is to be mobilized, the monarch gives the right half to the dispatched generals and locks it with the left half in the hands of the leading generals. Only when they are in conformity with each other, can they have the right to mobilize the army.