Among Roronoa Zoro's swords, his strongest and most renowned sword is known as "Wado Ichimonji." Wado Ichimonji is Zoro's primary sword and holds sentimental value to him. It was given to him by his childhood friend, Kuina, who passed away.

While all of Zoro's swords are formidable weapons, Wado Ichimonji stands out as a symbol of his determination and growth as a swordsman. It has accompanied Zoro throughout his journey, and he has consistently relied on its strength and capabilities.

Wado Ichimonji is a katana with a white hilt and a circular tsuba (handguard). It is a well-crafted and powerful blade, capable of delivering devastating strikes and cleaving through opponents. The sword embodies Zoro's dedication to his craft and his relentless pursuit of becoming the world's greatest swordsman.

It's important to note that Zoro's strength as a swordsman does not solely rely on the individual sword, but also on his skill, technique, and physical abilities. Zoro's strength comes from his training, determination, and the synergistic use of all his swords in his unique fighting style.