Exponent can share content sources with its modules. When you add a module to a page, you can choose to use existing content. By using the content picker, you can navigate to a page with an existing module of the same type, and select it to share its content with the module you are creating. This will allow you to update a module in one place, and the changes will take effect wherever else the module is being shared.

This text module in particular is being shared across 4 pages located under Other Cool Modules > Navigation Module: Sub Page 1, Sub Page 2, 4th Level Page, Another 4th Level Page. If you edit the content in this module, the changes will be applied to the text modules on all other pages sharing the source of this module.