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.