How to write double-struck letters
- Type your text into Input. For a single maths symbol, type just that capital, for example R for β.
- The double-struck version appears in Result as you type, digits included.
- Copy it into your notes, chat, document or bio.
Common double-struck symbols
| Symbol | Usual meaning |
|---|---|
| β | Natural numbers |
| β€ | Integers |
| β | Rational numbers |
| β | Real numbers |
| β | Complex numbers |
| β | Prime numbers, or probability |
| β | Quaternions |
| πΌ | Expected value in probability |
| π | Indicator function |
For papers, use the real thing
Pasted symbols are handy in chat, emails, forum posts and slides. For a paper or thesis, write them the way your editor expects. In LaTeX thatβs \mathbb{R}, which needs the amssymb or amsfonts package. On a web page you can use HTML entities such as ℝ for β and ℕ for β.
Outside maths, double-struck letters give names and headings an outlined look, like π»π π¦πππ π€π₯π£π¦ππ. Unlike most styles, the digits change too, so a year or a score stays in the same style.