Quadruple prime (⁗) is the General Punctuation character at Unicode U+2057 (QUADRUPLE PRIME). It is a single glyph of four primes — used for a fourth-order prime in math (e.g. f ⁗(x)). The preferred HTML form is the named entity ⁗.
Remember
Character ⁗
Unicode U+2057
Named entity ⁗
Hex entity ⁗
Decimal ⁗
CSS escape \2057
Named, numeric, and UTF-8 forms produce the same glyph: ⁗. Prefer ⁗ for readable, portable markup.
Using Named Entity: f⁗(x)
Using Hex Code: f⁗(x)
Using Decimal: f⁗(x)
Using Direct Character: f⁗(x)
Using CSS Entity: f⁗(x)
How It Works
1. Named:⁗ is the preferred HTML5 entity for U+2057.
2. Hex:U+2057 → ⁗ in HTML. Same glyph as the named form.
3. Decimal: same code point as 8279 → ⁗.
4. Direct: paste ⁗ in a UTF-8 file with <meta charset="UTF-8">.
5. CSS: use \2057 in content (not an HTML entity). The empty #point span receives that ⁗ via ::after.
Pitfalls & Tips
Common mistakes when working with this prime entity.
Name
Prefer ⁗
Use the named entity when possible. Numeric forms are fine for generators or when names are unavailable.
Case
⁗ ≠ ″
″ (capital P) is double prime (U+2033). ⁗ is quadruple (U+2057). Names are case-sensitive.
Not ASCII
Do not fake it with apostrophes
Four ASCII ' characters are not a quadruple prime. Use ⁗ for one typographic glyph.
Order
Pick the right prime order
First: ′. Second: ″. Fourth: ⁗. Do not reuse the wrong entity for the order you mean.
CSS vs HTML
Do not mix escapes
\2057 belongs in CSS. ⁗ / ⁗ belong in HTML.
UTF-8
Declare charset
If you paste ⁗ directly, serve the page as UTF-8 with <meta charset="UTF-8">.
Compatibility
Browser Support
Quadruple prime (U+2057) and its entity forms (⁗, ⁗, ⁗, CSS \\2057) are supported in all mainstream browsers. Glyph availability depends on the font.
✓ Universal support
Quadruple Prime (⁗)
Prefer ⁗, or encode with hex, decimal, or CSS escape — same glyph everywhere (when the font has it).
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+2057 / ⁗Full support
Bottom line: Prefer ⁗ in HTML. Use ⁗ or ⁗ as numeric alternatives, and \\2057 only inside CSS content.
Remember
Key Takeaways
Unicode: quadruple prime is U+2057 (decimal 8279), General Punctuation.
One line:U+2057 → ⁗ / ⁗ / CSS \2057.
Frequently Asked Questions
Prefer ⁗ (named). You can also use ⁗ (hex), ⁗ (decimal), type ⁗ in UTF-8, or the CSS escape \2057 in content.
U+2057 (QUADRUPLE PRIME). Hex 2057, decimal 8279. It belongs to General Punctuation and is used for a fourth-order prime mark.
Yes. HTML5 defines ⁗ for U+2057. Prefer it over numeric forms when you want readable markup.
Use it in math and science for a fourth-order prime (f⁗). Prefer ′ for first order and ″ for second order. Prefer ⁗ for portable HTML.
HTML entities (⁗, ⁗, or ⁗) go in markup. The CSS escape \2057 is used in stylesheets (usually in the content property of ::before/::after). Both render ⁗.
⁗ (⁗) is four primes in one character. ′ is ′ (U+2032, single). ″ is ″ (U+2033, double). Do not fake a quadruple prime with four ASCII apostrophes.
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Did you know?
Quadruple prime (⁗) is Unicode U+2057 (decimal 8279) — QUADRUPLE PRIME in General Punctuation. HTML5 named entity: ⁗. Prefer ⁗ in HTML. It marks a fourth-order prime (e.g. f⁗(x)). Single prime is ′ (U+2032); double is ″ (U+2033).
