Kogatana

The Kogatana is one of Juracule Mihawk's weapons. It is a dagger pendant shaped like a cross that is worn on his neck. Mihawk says he uses this weapon only to defeat weak opponents, and is the smallest known blade he has. Mihawk uses it is as more of an accesory than a weapon. Though it appears to have no value, in the hands of Mihawk, it was able to defeat Zoro with the slightest bit of pressure, and was able to stab close to his heart. He has also been shown eating with it.

Trivia

 * In the 4Kids dub, the kogatana's cross shaped sheath was edited out.
 * Although its name was never revealed in the manga, anime, or databooks, every game where this weapon appears has the "Kogatana" name.