The root sign is a mathematical symbol. The root sign is a symbol used to represent the root of a number or an algebraic expression. If a^n = B, then a is the root of B to the nth power or a to the 1/N power of B. The number or algebraic formula of the square root is written in the area surrounded by the right side of the v-shaped part on the left side of the symbol, and the lower part of the horizontal part above the symbol, and can not be out of bounds.