Sai

The sai is a defensive truncheon originating in Okinawa. It is often mistaken for a dagger, as its use in the TMNT media would reflect. Several characters in the series have used sai, but they are mostly associated with Raphael.

In traditional sai combat, they are carried in pairs, called saitachi. One is used for blocks and trapping weapons, while the other is used for striking, mostly with the knuckle.

Trivia

 * In the 2012 TV series, Raphael's sai is the only weapon out of the four Turtles that is not designed to be a lethal weapon, unlike Leo's katanas, Mikey's kusarigama, and Donnie's bo.
 * Before the 2012 series, Raph's sais and Leo's swords were the only weapons with blades.
 * The College Humor skit 'Donatello Gets Screwed' has Master Splinter telling Raphael that his sais are basically glorified gardening tools and to go nuts with them.