# \textbb

Used in text mode to apply blackboard bold font variant to text, with font selection based on bboldx package options

https://texform.dev/latex/commands/textbb

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Fonts and styles](https://texform.dev/latex/topics/fonts-styles) |
| Packages | bboldx |
| Allowed mode | text |
| Tags | presentation |
| Commonality | low |
| Kind | prefix |

## Syntax

### bboldx

Argument specification: `m:T`

Used in text mode to apply blackboard bold font variant to text, with font selection based on bboldx package options

## Examples

```latex
\text{\textbb{hello}}
```

[Open in Playground](https://play.texform.dev/?input=%5Ctext%7B%5Ctextbb%7Bhello%7D%7D)

## Renderer support

| Package | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- |
| bboldx | full | none | full |

## In TeXForm

TeXForm parses this entry as prefix syntax; the package determines its argument specification.

## See also

- [\\textbfbb](https://texform.dev/latex/commands/textbfbb)

## Test cases

### bboldx

| Input | Case | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- | --- |
| \textbb{a} | Positive: baseline | Pass | Fail | Pass |
| \textbb a | Positive: bare[0] | Pass | Fail | Pass |
| \textbb{a^2} | Negative: neg:T[0] | Pass | Fail | Fail |