---
title: "Reserved characters"
canonical: "https://support.appfire.com/space/COMALACM/656579465/Reserved%20characters"
format: markdown
---
> Macro (aura-html)

## Prohibited characters

Use of the following characters inside macro parameter values can result in a syntax error.

| **Characters** | **Why?** |
| --- | --- |
| `{ }` | Curly braces are used to denote macro tags |
| `|` | Pipes are used as a delimiter for macro parameters |

## Prohibited characters for metadata names

The following characters can not be used for metadata.

| **Characters** | **Why?** |
| --- | --- |
| `( ) * . : ; < > ? / \\ | # ^ \` | Confluence and Jira and installed apps use these |

## Special characters

The following characters have special meaning and may cause unexpected results if used improperly.

| **Characters** | **Why?** |
| --- | --- |
| `,` | Commas are used as a delimiter in comma-separated lists |
| `@` | "@" symbols are used to denote a value reference |
| `&` | Ampersands are used to mandate (OR → AND) all list items in setting conditions |
| `!` | Exclamation marks are used to negate conditions |
| `[ ]` | Used to denote links in wiki markup |

## See also

- [Reserved words](https://appfire.atlassian.net/wiki/spaces/COMALACM/pages/656579602)
- [Confluence internal metadata](https://appfire.atlassian.net/wiki/spaces/COMALACM/pages/656578765)