In "The Walking Dead" TV series, Michonne wields a katana as her primary weapon. The katana is a Japanese sword known for its curved blade and its historical significance as a samurai weapon.

The specific origin or background story of Michonne's katana is not explicitly addressed in the TV series. However, it is often assumed that the katana holds personal significance for Michonne as it becomes a key part of her character and survival throughout the show.

The katana used by Michonne on the show is visually distinctive, with a curved blade, a black handle wrapped in white cloth, and a guard adorned with three rings. This design is fictional and created specifically for Michonne's character in "The Walking Dead" TV series.

While the katana is an iconic weapon associated with Michonne, it does not have a specific name within the show. It is commonly referred to simply as "Michonne's katana" or "Katana" by fans and viewers.