(Power Cable) The cable used to supply
electric power to the
Evangelion from an external source because the
Eva has a very short active time as a
weapon. This cable could be considered the Eva's
weak point. For this reason, the
JSSDF units, during their attack on
NERV HQ, were instructed to concentrate their firepower on the umbilical cable (which they called the
power cable). Incidentally, "umbilical cable (cord)" means the
blood vessels which extend from baby's
navel to the
placenta of its mother's
womb. Thus, like a
baby receives nutrients through this
umbilical cord, the Eva receives electric power through the umbilical cable.
Source: The End of Evangelion : Glossary contained within The End of Evangelion - Theatrical Program.