The term shuriken did not just refer to the well-known ninja's throwing stars. Shuriken was also used to denote any instrument or tool thrown by a ninja, such as knives or darts. ¹⁾

The most proficient ninja clans in Japan were from the Iga and Koga (Koka) areas. Because of their geographical location, these ninja clans thrived in their abilities. They were protected because they were isolated between two mountain ranges. ²⁾

Hattori Hanzo was a Samurai who became renowned as one of Japan's most legendary ninjas. Although he was not a ninja, he used comparable tactics and frequently battled alongside them. Hattori was employed by the illustrious Tokugawa family and subsequently assisted Tokugawa Ieyasu in becoming Japan's king. Hattori earned his many renowned nicknames, including “ghost” and “devil,” as a result of his abilities and involvement in successful raids. Hattori was even mentioned in the film Kill Bill. ³⁾

Mochizuki Chiyome was a well-known female ninja of her day. Chiyome is a well-known pop culture personality, having appeared in several video games, films, and other forms of media. ⁴⁾

Ninjas devised a technique for transmitting secret signals through colored rice. Each rice hue represented a distinct significance. ⁵⁾

Ninjas frequently used nekome-jutsu, or the ability to tell the time by gazing into the eyes of a cat. Cats' eyes are extremely sensitive to light, causing their pupils to change shape at different times of the day. ⁶⁾

Female ninjas favored beautiful hairpins, known as kanzashi. Unlike other women's hairpins, female ninjas used their kanzashi for numerous purposes. Hairpins would be sharpened and dipped in poison to be used as weapons or assassination tools. ⁷⁾