The IPEA (International Project Evangelion Agency) is a mysterious organization under the jurisdiction of the United Nations.
The IPEA operate independently of NERV. They are in charge of the Eva containment facility that Unit-02 is placed within under the terms of the Vatican Treaty. Given that Unit-02 was later sortied against the 10th Angel, with Mari Illustrious Makinami as pilot and the facility's technicians assisting her, IPEA may also possess independent power to mobilize Evangelion units.
Unit-05's boot-up screen indicates that the subsystem is of IPEA manufacture, suggesting that IPEA also plays a role in the preparation of at least some Eva units.
IPEA's logo incorporates a three-eyed, two-cored, Eva-like being to which Evangelion Unit-01 at Near Third Impact achieves a strong resemblance. A more subtle allusion between the two is provided via the way the IPEA logo is situated over the containment silo doors: when the doors open, light streams out between the logo's two cores in much the same way as light streams from Unit-01's heart.