The word ninja is derived from the Japanese
phrase shinobi no mono. This phrase is written with two Kanji
(Chinese) characters, pronounced ren-zhe in Mandarin. The first
character, the same one used for ninjutsu, means endurance.
The second character means person.
The ninja are sometimes referred
to in another Chinese term "Lin
Gui" meaning "demons of the forests" for the beliefs
of possessing mystical powers.