A weapon of enormous destructive power possessed by the UN military and the JSSDF. Variations of this weapon include: N² mines, N² depth charges, N² air charges, N² bombs, etc. In episode 25', when Shigeru Aoba worried about the possible use of BC weapons, Makoto Hyuuga replied that N ² weapons were to be equally feared.

Source: The End of Evangelion : Glossary contained within The End of Evangelion - Theatrical Program.

Please note that the '2' in N2 is in superscript, as in 'N²', in the original program, however to ease the discovery of this write-up the node title is listed as simply N2.

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It is not clear what the N² stands for. It could stand for Non-Nuclear, as an N² Weapon has the destructive power of a nuclear bomb without the radiation.