Ninjato

His fingers relaxed around the hilt of the ninja-to, and the sword dropped to the ground. So did he, a moment later.

The ninjato had several other uses, as well as several other designs to accommodate these uses. For example, the scabbards of some ninjato were made longer than the blades. This design allowed for a secret compartment at the end of the scabbard that could store poisons or powders.