# Expressions for Aura Sites

You can access property values and other information to pass into a component's attributes with expressions.

An expression is any set of literal values, variables, subexpressions, or operators that can be resolved to a single value. Method calls aren’t allowed in expressions.

The expression syntax is {!expression}, where expression is a placeholder for the expression.

These expressions display the authenticated user’s information, images associated with data categories, or record information on a site page.

| Expression                                                                  | Displays                                                                                                                                                                     |
| --------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`{!CurrentUser.name}`**                                                   | Combined first and last name of the user, as displayed on the user detail page.                                                                                              |
| **`{!CurrentUser.firstName}`**                                              | First name of the user, as displayed on the user edit page.                                                                                                                  |
| **`{!CurrentUser.lastName}`**                                               | Last name of the user, as displayed on the user edit page.                                                                                                                   |
| **`{!CurrentUser.userName}`**                                               | Administrative field that defines the user’s login.                                                                                                                          |
| **`{!CurrentUser.id}`**                                                     | Salesforce ID of the user.                                                                                                                                                   |
| **`{!CurrentUser.email}`**                                                  | Email address of the user.                                                                                                                                                   |
| **`{!CurrentUser.communityNickname}`**                                      | Name used to identify the user in a site.                                                                                                                                    |
| **`{!CurrentUser.accountId}`**                                              | Account ID associated with the user. This expression displays a valid account ID for partner and customer users. For all others, it displays '000000000000000'.              |
| **`{!CurrentUser.effectiveAccountId}`**                                     | Account ID associated with the effective account. This expression displays a valid account ID for partner and customer users. For all others, it displays '000000000000000'. |
| **`{!Global.PathPrefix}/{!DataCategory.Name}.jpg`**                         | Image associated with the data category in a search component.                                                                                                               |
| **`{!Global.PathPrefix}/<Name of the Subfolder>/{!DataCategory.Name}.jpg`** | Image associated with the data category in a subfolder in a search component.                                                                                                |
| **`{!recordId}`**                                                           | 15-digit record ID on object pages.                                                                                                                                          |
| **`{!term}`**                                                               | Expression that returns the HTML-encoded search term in the Aura-based standard search page.                                                                                 |


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