Sai

The sai (釵, さい) is a pointed, dagger-shaped truncheon with two prong projecting from the handle, found in Okinawa and considered a part of the Okinawan kobudō tradition. It is related to several weapons, including the jutte of the Japanese Home Islands and the tekpi and tjabang of Indonesia. Unlike those weapons, it is generally not sharpened at the point, or only very rarely so.

Appearances:

This weapon actually has its own TV Tropes page.
 * The most famous fictional user of this weapon among Western audiences is probably Raphael of the Teenage Mutant Ninja Turtles, who prominently used twin sai.