Emergency Federal Register

The Emergency Federal Register (EFR) is the planned replacement for the Federal Register, the official journal of the United States government, in the event publication of the Federal Register is suspended by presidential decree following the onset of a severe national calamity, such as a major nuclear attack or a mainland invasion of the United States. According to the Office of the Federal Register, the Emergency Federal Register "can only be activated under extreme national security conditions".

Source: Wikipedia — Emergency Federal Register (CC BY-SA 4.0)