# abbreviation-punctuation (UNS009)

## What it does

Checks that these abbreviations use the correct punctuation: `i.e.`, `e.g.`,
and `et al.`. A comma after `i.e.` or `e.g.` is not required by this rule.

## Why is this bad?

These are misspellings.

## Example

```latex
The abbreviation ie is incorrect.
The abbreviation i.e. is correct.
The authors et. al. are listed.
The authors et al. are listed.
```