Copy √ in one tap, or pick from 29 rows: roots under a bar, √2, ±√, ∛ and ∜.
Square Root Symbol Copy and Paste
√Square rootU+221AReady to copy
29 root characters and strings. Tap any value to copy it.
Nothing here matches. Try a shorter word, or paste the character itself.
29 root characters and strings. A character and its name both copy the character. A code copies the code.
Character
Name
Code point
Alt code
Option keys
HTML
LaTeX
U+221A. The square root sign, which Unicode also calls radical sign. Alt+251 on a number pad, √ in HTML. The character has no bar on top: \sqrt{x} in LaTeX draws one, and \surd prints the bare sign. In Unicode since version 1.1 (1993).
Made of U+221A and U+203E. The sign followed by U+203E Overline, so the bar starts where the sign ends. Whether the two touch depends on the font.
Made of U+221A, U+0078 and U+0305. The x is followed by U+0305 Combining overline, which Unicode also calls vinculum. Paste that mark after every character that belongs under the bar.
Made of U+221A, U+0028 and U+0029. For plain text, where brackets do the job of the bar. Type the radicand, the part being rooted, between them.
Made of U+221A and U+0032. About 1.41421, the diagonal of a square with sides of 1, and probably the first number known to be irrational. The A series of paper sizes is built on it.
Made of U+00B1 and U+221A. Every positive number has two square roots, and √ alone means the positive one. The ± brings the other back. ± is Alt+241 on a number pad.
Made of U+221A, U+2212 and U+0031. The imaginary unit: by convention the principal square root of −1 is i. Written with U+2212 Minus sign, not a hyphen.
U+23B7. The foot of a tall root sign. Unicode files it under Terminal graphic characters: DEC terminals joined it to line pieces on the row above to draw the bar. Added in version 3.2 (2002).
U+221B. A root sign with a small 3 in its crook. No Alt code and no named HTML entity. In LaTeX it is \sqrt[3]{x}. The cube root page has the rest.
U+221C. A root sign with a small 4. \sqrt[4]{x} in LaTeX. The standard sign stops here: Unicode has no single character for a fifth root.
U+0606. The cube root sign of Arabic text. Unicode files it under Radix symbols in the Arabic block and cross-references ∛. Added in version 5.1 (2008).
U+0607. The fourth root sign of Arabic text, cross-referenced to ∜. The Arabic block has no square root of its own among its two radix symbols.
Made of U+221A and U+203E. Two overlines for a longer radicand. Overlines join each other in a row, which the macron ¯ does not.
Made of U+221A, U+0032 and U+0305. The digit 2 with U+0305 Combining overline after it. Swap the 2 for your own digit and keep the mark.
U+203E. Unicode's note: spacing overscore. Type one after √ for each character of the radicand, and they join into one bar. ‾ in HTML.
U+0305. Unicode's note: overscore, vinculum, connects on left and right. It lands on the character typed before it, so it goes after each digit under the root.
U+00AF. Looks like a short overline, but Unicode's note says adjacent macrons do not join, unlike U+203E. Alt+0175 on a number pad, ¯ in HTML.
Made of U+221A and U+0033. About 1.73205. Like the root of any whole number that is not a perfect square, it is irrational.
Made of U+221A and U+0035. About 2.23607, and irrational like √2 and √3, so its digits never repeat.
Made of U+221A and U+03C0. Root pi in one string. π alone is Alt+227 on a number pad and π in HTML.
Made of U+0031, U+002F, U+221A and U+0032. About 0.70711, which is 1 divided by 1.41421. Typed with the plain slash.
Made of U+221A and U+0078. The bare sign and a letter, the usual way to write it where no bar can be drawn. The same thing as an exponent is x to the power 1/2.
U+2713. A tick, not a maths sign, though Unicode's entry for √ cross-references it. ✓ in HTML, \checkmark in LaTeX with the amssymb package.
U+2714. The heavy tick. It has the Emoji property, so some apps draw it in colour, which no root sign does.
U+27CC. The bracket of long division. Unicode's note: graphically extends over the dividend. Added in version 5.1 (2008).
U+00B2. The way back: squaring undoes a square root. Unicode's note: squared. Alt+253 on a number pad, ² in HTML.
U+1CEDD. New in version 18.0, released on 16 September 2026. Unicode files it under Radix signs for historical mathematics and cross-references √.
U+1CEDE. By its name the square root taken three times, which is an eighth root. Added in Unicode 18.0 (2026).
U+1CEDF. The longest name on this page: the square root taken four times, a sixteenth root. Added in Unicode 18.0 (2026).
The square root symbol is √, Square root, U+221A, which Unicode also calls the radical sign. It has no bar on top, so the 29 rows add overlines, brackets and ready-made roots such as √2, then ∛, ∜ and the look-alikes.
Read the full guide
Putting the bar over the number
The bar is called a vinculum, and no root character carries one. For digits under a bar, paste U+0305 Combining overline after each digit: √2̅5̅. The spacing overline ‾ only lengthens the sign, as in √‾. In plain text, √(x + 1) lets brackets do the work. In LaTeX, \sqrt{x + 1} draws a bar of the right length.
Tips
∛ and ∜, the cube root and fourth root symbols, are rows nine and ten. Unicode has no fifth root character.
In LaTeX, \sqrt{x} draws the bar, \surd prints the bare sign and \sqrt[3]{x} adds an index. All three work with no package.
Every positive number has two square roots, and √ alone means the positive one. For both, copy Plus or minus root, ±√.
Questions and answers
How do I type the square root symbol on a keyboard?
On Windows, switch Num Lock on, hold Alt and type 251 on the number pad. In Word, type 221A, then press Alt and X. On a Mac with the U.S. layout, press Option and V. On Linux, press Compose, then v, then slash.
Is the radical symbol the same as the square root symbol?
Yes. Unicode lists radical sign as the other name of √, U+221A, so there is one root symbol to copy and paste under both names. The only root sign with radical in its own name is ⎷, Radical symbol bottom, from old terminal graphics.
What is the HTML code for the square root symbol?
√ is the named entity, and √ or √ is the numeric form. HTML has no named entity for ∛ or ∜, so write ∛ and ∜ for those.
Why does the square root symbol have no line on top?
√ was first used in print in 1525, in Christoph Rudolff's Coss, with no bar. Descartes joined the sign to the bar in 1637. Unicode encodes the bare sign only, so the bar comes from overline characters or from LaTeX.
∛Cube rootU+221B. A root sign with a small 3 in its crook. No Alt code and no named HTML entity. In LaTeX it is \sqrt[3]{x}. The cube root page has the rest.
∜Fourth rootU+221C. A root sign with a small 4. \sqrt[4]{x} in LaTeX. The standard sign stops here: Unicode has no single character for a fifth root.
±√Plus or minus rootMade of U+00B1 and U+221A. Every positive number has two square roots, and √ alone means the positive one. The ± brings the other back. ± is Alt+241 on a number pad.
⎷Radical symbol bottomU+23B7. The foot of a tall root sign. Unicode files it under Terminal graphic characters: DEC terminals joined it to line pieces on the row above to draw the bar. Added in version 3.2 (2002).
√Square rootU+221A. The square root sign, which Unicode also calls radical sign. Alt+251 on a number pad, √ in HTML. The character has no bar on top: \sqrt{x} in LaTeX draws one, and \surd prints the bare sign. In Unicode since version 1.1 (1993).
Show all 29 root characters and strings (24 more)
Start here, continued
√2Square root of 2Made of U+221A and U+0032. About 1.41421, the diagonal of a square with sides of 1, and probably the first number known to be irrational. The A series of paper sizes is built on it.
√−1Square root of minus oneMade of U+221A, U+2212 and U+0031. The imaginary unit: by convention the principal square root of −1 is i. Written with U+2212 Minus sign, not a hyphen.
√x̅Square root of x, under a barMade of U+221A, U+0078 and U+0305. The x is followed by U+0305 Combining overline, which Unicode also calls vinculum. Paste that mark after every character that belongs under the bar.
√‾Square root with an overlineMade of U+221A and U+203E. The sign followed by U+203E Overline, so the bar starts where the sign ends. Whether the two touch depends on the font.
√()Square root with bracketsMade of U+221A, U+0028 and U+0029. For plain text, where brackets do the job of the bar. Type the radicand, the part being rooted, between them.
Root signs 2
؆Arabic-indic cube rootU+0606. The cube root sign of Arabic text. Unicode files it under Radix symbols in the Arabic block and cross-references ∛. Added in version 5.1 (2008).
؇Arabic-indic fourth rootU+0607. The fourth root sign of Arabic text, cross-referenced to ∜. The Arabic block has no square root of its own among its two radix symbols.
With a bar on top 5
̅Combining overlineU+0305. Unicode's note: overscore, vinculum, connects on left and right. It lands on the character typed before it, so it goes after each digit under the root.
¯MacronU+00AF. Looks like a short overline, but Unicode's note says adjacent macrons do not join, unlike U+203E. Alt+0175 on a number pad, ¯ in HTML.
‾OverlineU+203E. Unicode's note: spacing overscore. Type one after √ for each character of the radicand, and they join into one bar. ‾ in HTML.
√2̅Square root of 2, under a barMade of U+221A, U+0032 and U+0305. The digit 2 with U+0305 Combining overline after it. Swap the 2 for your own digit and keep the mark.
√‾‾Square root with a long overlineMade of U+221A and U+203E. Two overlines for a longer radicand. Overlines join each other in a row, which the macron ¯ does not.
Ready-made roots 5
1/√2One over root 2Made of U+0031, U+002F, U+221A and U+0032. About 0.70711, which is 1 divided by 1.41421. Typed with the plain slash.
√3Square root of 3Made of U+221A and U+0033. About 1.73205. Like the root of any whole number that is not a perfect square, it is irrational.
√5Square root of 5Made of U+221A and U+0035. About 2.23607, and irrational like √2 and √3, so its digits never repeat.
√πSquare root of piMade of U+221A and U+03C0. Root pi in one string. π alone is Alt+227 on a number pad and π in HTML.
√xSquare root of xMade of U+221A and U+0078. The bare sign and a letter, the usual way to write it where no bar can be drawn. The same thing as an exponent is x to the power 1/2.
Look-alikes and the way back 4
✓Check markU+2713. A tick, not a maths sign, though Unicode's entry for √ cross-references it. ✓ in HTML, \checkmark in LaTeX with the amssymb package.
✔Heavy check markU+2714. The heavy tick. It has the Emoji property, so some apps draw it in colour, which no root sign does.
⟌Long divisionU+27CC. The bracket of long division. Unicode's note: graphically extends over the dividend. Added in version 5.1 (2008).
²Superscript twoU+00B2. The way back: squaring undoes a square root. Unicode's note: squared. Alt+253 on a number pad, ² in HTML.
May be an empty box 3
Square root of square rootU+1CEDD. New in version 18.0, released on 16 September 2026. Unicode files it under Radix signs for historical mathematics and cross-references √.
Square root of square root of square rootU+1CEDE. By its name the square root taken three times, which is an eighth root. Added in Unicode 18.0 (2026).
Square root of square root of square root of square rootU+1CEDF. The longest name on this page: the square root taken four times, a sixteenth root. Added in Unicode 18.0 (2026).