Ninja
A ninja (忍者; English: , Japanese: [ɲiꜜɲ.dʑa]), shinobi no mono (忍の者; Japanese: [ɕi.no.bʲi no mo.noꜜ]) or shinobi (忍び; Japanese: [ɕi.no.bʲi]) was a spy and infiltrator in pre-modern Japan. Antecedents may have existed as early as the 12th century.