GlyphIndexExact root
√81 = 9
The principal square root of eighty-one is nine.
Square-root sign
The square-root sign √ introduces the principal square root. In plain text, parentheses show how much of the expression is under the root.
SQUARE ROOT
Appearance can vary by font.
Character details
♡→✦
3 code pointsMeaning and context
The square-root sign √ introduces the principal square root. In plain text, parentheses show how much of the expression is under the root.
How to use it
For an expression longer than a single number or variable, add parentheses. Use a mathematical typesetting system when a spanning radical bar is necessary.
Examples
Grouped expression
√(9 + 16) = 5
Parentheses make the entire sum the radicand.
Similar shapes, different characters
Check mark
U+2713A check mark indicates a status in a chosen convention; it is not a radical.
Cube-root sign
U+221BThis introduces a cube root, a different operation.
Sources and method
- Unicode 18.0.0 character database — Pinned standard character identities and properties; the application computes UTF encodings from the original text.
- Unicode character code charts — Reference glyphs are not a guarantee of the appearance in a user’s font.