Square Root Sign HTML entity √

√ is the HTML entity for Square Root Sign √ (U+221A). Copy the decimal √ and hex √ codes plus CSS, JavaScript, Python and URL escapes.

Entity: √
Also written: &Sqrt;
Code point: U+221A
Unicode name: SQUARE ROOT
Block: Mathematical Operators
Category: Math symbol (Sm)
Since: Unicode 1.1
Defined in: HTML 4.01 and HTML5

Codes to copy

HTML named	`√`Works in HTML; in XML only & < > " ' are predefined.
HTML decimal	`√`Works in HTML and XML.
HTML hex	`√`Works in HTML and XML.
CSS	`content: "\221A";`In a stylesheet, for ::before and ::after.
JavaScript	`"\u221A"`Also valid in JSON.
Python	`"\u221a"`Python 3 string literal.
Python by name	`"\N{SQUARE ROOT}"`Readable alternative using the Unicode name.
URL	`%E2%88%9A`Percent-encoded UTF-8 bytes, for a path or query value.
UTF-8 bytes	`E2 88 9A`3 bytes.
UTF-16	`221A`1 code unit, which is what JavaScript length counts.

When to use it

The radical sign. The bar over the number cannot be drawn with the character alone, so √2 is fine for short cases while longer expressions need MathML.

The name dates from HTML 4, so it works in every browser and in old email clients.

More maths operators

All maths operators · Every HTML entity · Encode or decode text

Source: the WHATWG HTML Standard list of named character references and the Unicode Character Database (Unicode 18.0).