The N² Technology ("N²" being short for Non-Nuclear) is a technology seen throughout various Evangelion series in different forms.
N² Weapons
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An N² mine explosion in Rebuild

N² mine explosion in the original series
N² weapons (N² 兵器, N² heiki) is the name given to the strongest conventional (non-Evangelion) weapons ever created by mankind. N² weapons are as strong as nuclear bombs, even being capable of producing electro-magnetic pulses, but they lack the radioactive fallout generated by their nuclear counterparts, allowing them to be used more readily than their predecessors. They are capable of dealing moderate damage to some of the weaker Angels, as can be seen during Sachiel's attack to Tokyo-3, although even several detonations of N² weapons are incapable of affecting others. It has been said that the N² weapons are broadly similar to a low-yield nuclear warhead, with no apparent fallout comparable to FOABs and other real life Thermobaric weapons.
N² weapons come in five basic forms.
- N² bomb (N²爆弾, bakudan)
- Episode 19: Used on Zeruel by Unit-00'. It destroys Unit-00's right arm, which was in contact with the bomb, but Zeruel was unaffected by the explosion at point blank.
- Episode 25': Dropped onto the extension of Ashinoko where Tokyo-3 had been to open up the Geofront.
- N² depth charge (N²爆雷, N² bakurai)
- Episode 09: Used on Israfel Alpha and Beta to temporarily incapacitate them and give the pilots some time for preparations.
- N² land mine (N²地雷, N² jirai)
- Episode 01: Set in Sachiel's path to temporarily halt its advance. Despite the Angel being damaged to some extent, the mine failed to kill it.
- Evangelion 1.0: Used in the same manner on Sachiel.

N² aerial weapon has no effect on Sahaquiel
- N² aerial weapon (N²航空兵器, N² koukuu heiki)
- Episode 12: Used on Sahaquiel multiple times, but without any real effect.
- Evangelion 2.0: Used in the same manner on Sahaquiel.
- N² missile
- Evangelion 2.0: Used on Zeruel by Unit-00'. It destroys Unit-00's arms and chars Unit-00', but once again Zeruel is not visibly damaged at all.
N² Reactor
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N² Reactor is a technology appearing in Neon Genesis EVANGELION (3 Years After) -ANIMA-. It is used on the UX-1 Allegorica support unit and Evangelion EUROII Heurtebize. Its purpose is essentially the same as the S² Engine's one as it grants the Eva unit an unlimited amount of operational time. However, it uses N²-derived technologies to achieve this.
Note
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- Although "N²" is always written with a superscript "2", it is not pronounced "N-squared", but simply "N-two".