"Optical Network Terminal". These are used to terminate the fiber and break out the voice, data and video services. They have internal batteries to provide about four hours of service without power. They also have a wall-wart power supply that powers the ONT under normal conditions. Yes, the Verizon rocket scientists manage to install these too. I've never seen that part of one of their installations, but I can only imagine. Gone are the days of the phone working when the power is out for a day or more.
ONT's are similar to the traditional copper "NID" (Network Interface Device"), only much larger in size.
