HTML Entity for Uppercase Z Double Struck Capital (ℤ)
Beginner
5 min read
Updated: Sep 2026
1 example
Unicode U+2124
Definition
What Is Uppercase Z Double Struck Capital?
Double-struck capital Z (ℤ) is the Unicode character at U+2124 in Letterlike Symbols. Official name: DOUBLE-STRUCK CAPITAL Z — a blackboard-bold Z used in mathematics for the set of integers.
Remember
Character ℤ
Unicode U+2124
Named entity ℤ or ℤ
Hex entity ℤ
Decimal ℤ
CSS escape \2124
Not the same Z · Ż · ℕ
Prefer ℤ or ℤ in HTML markup. Numeric forms and typing ℤ in UTF-8 also work. Use a math-capable font when the glyph must look clearly double-struck.
Using Named Entity: ℤ
Using Alias: ℤ
Using Hex Code: ℤ
Using HTML Code: ℤ
Using CSS Entity: ℤ
Typed: n ∈ ℤ
How It Works
1. Named:ℤ and ℤ both resolve to U+2124 — the clearest HTML forms.
2. Hex:U+2124 → ℤ in HTML. Same glyph as the named entities.
3. Decimal: same code point as 8484 → ℤ. Same glyph as hex and named.
4. CSS: use \2124 in content (not an HTML entity). #point::after appends that ℤ after the paragraph text.
5. Typed / math: paste ℤ in UTF-8, or write n ∈ ℤ with a math font for clearer blackboard bold.
Pitfalls & Tips
Common mistakes when working with U+2124.
vs Z
Not a plain letter
ASCII Z is for words. ℤ is a math symbol for integers — different code points and roles.
vs Ż
Not Polish Ż
Ż (Ż) is a Latin letter with a dot. ℤ is letterlike / blackboard bold.
Fonts
Glyph depends on font
Some fonts draw U+2124 weakly. Prefer a math font (for example Cambria Math or STIX) when the double-struck look matters.
Aliases
ℤ = ℤ
Both named entities map to the same character. Pick one style and stay consistent.
Encoding
Keep UTF-8 declared
Letterlike symbols display reliably with <meta charset="UTF-8">. Prefer named entities when encoding is uncertain.
CSS vs HTML
Do not mix escapes
\2124 belongs in CSS strings. ℤ / ℤ / ℤ belong in HTML.
A11y
Say what it means
When ℤ appears alone, nearby text should make the meaning clear (for example “integers” or n ∈ ℤ) so screen-reader users get context.
Compatibility
Browser Support
Double-struck capital Z (U+2124) and its entity forms (ℤ, ℤ, ℤ, ℤ, CSS \\2124) are supported in all mainstream browsers. Visible blackboard-bold style depends on available fonts.
✓ Universal support
Uppercase Z Double Struck Capital (ℤ)
Encode with named, hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+2124 / ℤFull support
Bottom line: Prefer ℤ or ℤ in HTML. Use \\2124 only inside CSS content. Do not confuse with plain Z or Polish Ż.
Remember
Key Takeaways
Unicode: double-struck capital Z is U+2124 (decimal 8484) — glyph ℤ.
HTML: prefer ℤ or ℤ — also ℤ / ℤ.
CSS: use \2124 inside content for generated text.
Meaning:ℤ is the integers set — not plain Z, not Polish Ż, not ℕ (naturals).
Use ℤ or ℤ (named), ℤ (hex), ℤ (decimal), type ℤ directly in UTF-8, or the CSS escape \2124 in content. Prefer ℤ or ℤ in normal HTML.
U+2124 (DOUBLE-STRUCK CAPITAL Z). Hex 2124, decimal 8484. It belongs to Letterlike Symbols (U+2100–U+214F).
Yes. Use ℤ or ℤ. Numeric forms ℤ and ℤ also work.
No. ℤ is a letterlike mathematical symbol (blackboard bold Z) for the integers. Plain Z is U+005A — a normal Latin letter.
Use it in mathematical text for the set of integers — often written n ∈ ℤ — not as a substitute for alphabetic Z in ordinary words.
HTML entities (ℤ, ℤ, ℤ, or ℤ) go in markup. The CSS escape \2124 goes in stylesheet strings (usually content on ::before/::after).
🤔
Did you know?
Double-struck capital Z is Unicode U+2124 (decimal 8484) — glyph ℤ in Letterlike Symbols (U+2100–U+214F). HTML5 names it ℤ and also ℤ. Official name: DOUBLE-STRUCK CAPITAL Z. In mathematics it denotes the set of integers. Do not confuse with plain Z (U+005A) or Polish Ż (Ż).
