Electromagnetic Pulse

EMP stands for ElectroMagnetic Pulse, a device capable of rendering technology in it's field of range useless or completely destroyed beyond repair. In the final chapter of Reconstruction (Chapter 19), Agent Washington activates the EMP to terminate the AI and other technology at command. The compound is seen to shut down, vehicles are disbled and Washington and the Meta are seen to be 'swallowed up' by the EMP, though their fate, amongst the fate of the AI is unconfirmed.

"Emp"
While EMP is pronounced as individual letters by Washington (as it should normally be), everyone he meets, even the computer terminal activating it calls it and 'Emp', much to Washington's frustration.