Computational symbols are symbols used in computational mathematics, including plus sign, minus sign, multiplication sign and division sign. Addition and subtraction operations are the two earliest mathematical operations mastered by human beings, which are recorded in the earliest written records of human beings. Ammers papyrus in ancient Egypt contains plus and minus signs: the "+"on the right leg is a plus sign and the "-"on the left leg is a minus sign. The latter means "square" in Moscow papyrus. The plus sign is the calculation symbol used when calculating the addition. China people's calculation method, China ancient times pay attention to using tools to calculate, the general operation is carried out on the calculation or abacus, and only the results are recorded, so mathematical symbols are not used, and the operation is expressed in words when recording.