A
close-quarters weapon which slices through objects it contacts at the
molecular level using a blade formed of high-
frequency vibrating particles. One of the standard armaments for
Eva, it is normally housed in the
shoulder portion.
Eva-02 uses a new cutter-type knife -- even if the
blade breaks off, a spare blade can be extended, making the
knife usable again. It is often called by its abbreviated form:
Prog Knife.
Source: The End of Evangelion : Glossary contained within The End of Evangelion - Theatrical Program.