---
title: "Reserved characters"
canonical: "https://support.appfire.com/space/CDML/649859070/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 labels

The following characters can not be used for content labels.

| **Characters** | **Why?** |
| --- | --- |
| `!` `#` `&` `(` `)` `*` `,` `.` `:` `;` `<` `>` `?` `@` `[` `]` `^` | Confluence places these restrictions on labels |

## Prohibited characters for state names

The following characters can not be used for state names.

| **Characters** | **Why?** |
| --- | --- |
| `:` `,` `;` `<` `>` `@` `/` `\` `|` `#` `[` `]` `{` `}` `^` `\` `=` | Confluence places these restrictions on characters |

## Special characters

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

| **Characters** | **Why?** |
| --- | --- |
| `,` | Commas are used as a delimiter in comma-separated lists |
| `@` | "At" symbols are used to denote [Value References](https://appfire.atlassian.net/wiki/spaces/CDML/pages/649694302) |
| `&` | Ampersands are used to mandate (OR → AND) all list items in [Conditions](https://appfire.atlassian.net/wiki/spaces/CDML/pages/649694110) |
| `!` | Exclamation marks are used to negate [Conditions](https://appfire.atlassian.net/wiki/spaces/CDML/pages/649694110) |
| `[` `]` | Used to denote links in wiki markup |