The Resource Pool is the commonly used name for the Resources List in EPM Live.
Resources are added to the Resource Pool for the Site App. A resource can be either a named user or a generic resource. When named users are added to the Resource Pool, the resources' email address associates them to their EPM Live user account (which would also be their SharePoint account). The Resource Pool within EPM Live stores resource information such as resource name, user permissions (if applicable), and other attributes.