Radical symbol | square root symbol
Mathematicalsymboldenotingaroot"√"redirectshere.Forthechecksymbol(✓),seeCheckmark.Inmathematics,theradicalsign,radicalsymbol,rootsymbol,radix,orsurdisasymbolforthesquarerootorhigher-orderrootofanumber.Thesquarerootofanumberx{displaystylex}iswrittenasx,{displaystyle{sqrt{x}},}whilethen{displaystylen}throotofx{displaystylex}iswrittenasxn.{displaystyle{sqrt[{n}]{x}}.}Itisalsousedforothermeaningsinmoreadvancedmathematics,suchastheradicalofanideal.Inlinguistics,thesymbolisusedtodenotearootword.Pr...
Mathematical symbol denoting a root
"√" redirects here. For the check symbol (✓), see Check mark.In mathematics, the radical sign, radical symbol, root symbol, radix, or surd is a symbol for the square root or higher-order root of a number. The square root of a number x{displaystyle x} is written as
x,{displaystyle {sqrt {x}},}while the n{displaystyle n}th root of x{displaystyle x} is written as
xn.{displaystyle {sqrt[{n}]{x}}.}It is also used for other meanings in more advanced mathematics, such as the radical of an ideal.
In linguistics, the symbol is used to denote a root word.
Principal square root[edit]Each positive real number has two square roots, one positive and the other negative. The square root symbol refers to the principal square root, which is the positive one. 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 i...