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忍者, the Japanese ninja symbol (kanji).

A Ninja (忍者; plural ninja or ninjas) is one who trains in the art of ninjutsu. They were originally assassins and spies in feudal Japan.  A synonym for ninja is shinobi (忍び), although Ninja Turtles: The Next Mutation made it seem like this was a different class altogether. Female ninja are popularly called kunoichi (くノ一).

Ninja in the TMNT Universe