the square root, also called the quadratic root, is expressed as [√￣]. the square root of a non-negative number is called an arithmetic square root. a positive number has two real square roots, which are opposites of each other; 0 has only one square root, which is 0 itself; and a negative number has two conjugate pure imaginary square roots.

generally, "√￣" is only used to represent arithmetic square roots, that is, non-negative square roots. for example: √16=4.