One of those mathematicians was Abū al-Hasan ibn Alī al-Qalasādī (1421–1486). Some sources imply that the symbol was first used by Arab mathematicians. The origin of the root symbol √ is largely speculative. For the definition of the principal square root of other complex numbers, see Square root#Principal square root of a complex number. The two square roots of a negative number are both imaginary numbers, and the square root symbol refers to the principal square root, the one with a positive imaginary part. The square root symbol refers to the principal square root, which is the positive one. In linguistics, the symbol is used to denote a root word.Įach positive real number has two square roots, one positive and the other negative. It is also used for other meanings in more advanced mathematics, such as the radical of an ideal. The square root of a number x is written as In mathematics, the radical symbol, radical sign, root symbol, radix, or surd is a symbol for the square root or higher-order root of a number. For symbols used by political radicals, see List of ideological symbols.
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