Kunoichi

女 becomes くノ一

The term is thought to derive from the names of characters that resemble the three strokes in the Japanese kanji character for "woman" (女, onna) in the following stroke order:

• "く" is a hiragana character pronounced "ku"
• "ノ" is a katakana character pronounced "no"
• "一" is a kanji character pronounced "ichi" (and meaning "one").

The word "kunoichi" was not used frequently in Edo period. This is probably because in this era, kanji letter "女" was not written in regular script but usually in cursive script, and the cursive script of "女" cannot be decomposed into "く", "ノ", and "一".^{Yoshimaru:p168}

A signboard of a ninja(L) and a kunoichi(R) at Uenoshi Station(aka Ninja City Station) in Japan, 2019.

The eighth volume of the ninja handbook Bansenshukai written in the late 17th century describes Kunoichi-no-jutsu (くノ一の術, Ninjutsu of female ninja). This can be translated as "a technique to use a female"^{Yoshimaru:p170} and was employed for infiltration purposes.[1] The Bansenshukai compiles the knowledge of the clans in the regions of Iga and Kōga dedicated to the formation of ninjas. According to this document, the main function of the Kunoichi was espionage, finding functions in enemy house services, to gather knowledge, gain trust or listen to conversations. A disputed historical example is Mochizuki Chiyome, a 16th-century noble descendant who was commissioned by warlord Takeda Shingen to recruit women to create a secret network of hundreds of spies.[1]

The meaning "female ninja" might be a purely modern use, that possibly first appeared in the novel Ninpō Hakkenden (忍法八犬伝) written by Futaro Yamada in 1964 and became popularized in the following years.^{Yoshimaru:p184}.

The manga series Tail of the Moon shows a group of young women practicing-in-training who seeks with a master art in order to learn the art of Ninja. They are described as kunoichi.[2]

• Hatsume no Tsubone, a legendary female ninja in Tokugawa Ieyasu's service
• Mochizuki Chiyome, a Japanese woman who claimed to be a female ninja leader
• Onna-bugeisha, samurai women
• Umemura Sawano, 16th–17th century female ninja

• Katsuya Yoshimaru (associate professor of Mie University) (April 2017). "What is Kunoichi? (くのいちとは何か)". Origins of the Ninja (忍者の誕生). ISBN 978-4-585-22151-7.