# \mathbfbb

Used in documents that need a bold blackboard-bold alphabet from the bboldx package, e.g. emphasizing special symbol families while keeping blackboard-bold styling.

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

## Metadata

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

## Syntax

### bboldx

Argument specification: `m`

Used in documents that need a bold blackboard-bold alphabet from the bboldx package, e.g. emphasizing special symbol families while keeping blackboard-bold styling.

## Examples

```latex
\mathbfbb{R}
```

[Open in Playground](https://play.texform.dev/?input=%5Cmathbfbb%7BR%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

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

## Test cases

### bboldx

| Input | Case | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- | --- |
| \mathbfbb{a} | Positive: baseline | Pass | Fail | Pass |
| \mathbfbb a | Positive: bare[0] | Pass | Fail | Pass |