Finally, the Confidential classification should be used for extremely sensitive material. This classification usually breaks down into two sub-categories: business-specific and employee-specific. Business-specific confidential material could include financials (if the company is not publicly traded), product rollout dates, or customer information (credit card numbers, address information, and even social security numbers). Employee-specific confidential material could include employee salary, employee personal information (social security number, address, phone numbers, personal information of employee dependents), or HR related issues.
Example:
CONFIDENTIAL
This document should only be viewed by it's intended recipient.
It should not be shared with anyone but senior management or a member of HR.