Double-struck Capital Z Letter
ℤ is the double-struck capital Z symbol, often used to denote the integers in mathematical text.
U+2124
ℤ is a stylized character used in writing that looks like a “double-struck” capital Z. It’s commonly seen in mathematics and educational material. You can copy it directly or insert it using its Unicode details.
Double-struck Capital Z Letter Meaning
ℤ (DOUBLE-STRUCK CAPITAL Z, U+2124) is widely used as a symbol for the set of integers. In mathematical writing, it typically appears in statements about numbers, number properties, and algebraic structures—for example, when distinguishing integers from natural numbers or real numbers. Because it is a specific Unicode character, it may render differently from a plain “Z” depending on fonts, but the character itself remains consistent across compliant systems. In addition to pure math notes, it’s also used in contexts where you want a distinctive “math blackboard” look without drawing your own text styling.
Common uses
- •Denoting the set of integers in math homework, notes, and textbooks
- •Labeling variables or domains in algebra and number theory explanations
- •Formatting equations in scientific writing and slide decks
- •Using as a typographic “math blackboard” symbol in educational graphics
- •Including in web content where Unicode math symbols are supported
Examples
ℤ (Double-struck capital Z) — Copy & Info
- ℤLet x ∈ ℤ.
- ℤℤ is closed under addition and subtraction.
- ℤFind all solutions in ℤ.
- ℤThe polynomial has integer roots: {r ∈ ℤ | ...}.
- ℤWe compare ℕ, ℤ, and ℚ in number systems.
Variations
Technical codes
| Unicode | U+2124 | |
| HTML Entity | ℤ | |
| HTML Code | ℤ | |
| CSS | \2124 | |
| Alt Code | Alt + 8484 | |
| Decimal | 8484 |
How to type Double-struck Capital Z Letter (ℤ)
On Windows
Hold Alt and type 8484 on the numeric keypad. In Word, type 2124 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 2124. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 2124, then press Enter or Space.
Anywhere
Copy ℤ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What does ℤ stand for?
It most commonly denotes the set of integers in mathematical writing.
Is ℤ the same as a normal capital Z?
No. ℤ is a distinct Unicode character (U+2124) with a double-struck appearance.
How can I copy ℤ from this page?
Select and copy the character “ℤ”, or use the provided Unicode/HTML/CSS escape forms on the page.
Why does ℤ look different in my document?
Rendering depends on the font and app you’re using. The Unicode character stays the same, but the visual style can vary.