Perform the following procedure to rename a content namespace to describe what a namespace contains:
Procedure
Navigate to EM > Tools > Media Management.
On the Media Management page, select the check box next to the namespace you want to rename.
Click Rename.
On the Rename Content Namespace page, type a unique name for the new namespace in the Name field.
The name cannot begin with the at (@) symbol, must be less than 128 characters, must not be case-sensitive, and must not contain spaces or any of the following symbols: