What value does a $Permission global variable return if the running user has the specified custom permission?

The global variable $Permission is used in Salesforce to check whether a user has a specific custom permission. When evaluating a custom permission through this global variable, if the running user possesses the defined custom permission, the return value is true. This boolean result indicates the presence of the permission, allowing developers to conditionally control the visibility of components and logic based on user access rights.

This mechanism is crucial for implementing security and access controls within Salesforce applications, ensuring that functionality is only available to users who it has been explicitly granted to via custom permissions. Thus, receiving "true" directly informs the system or user interface that the necessary permissions are in place for the action or visibility intended.