Sanzen Sekai is one of Roronoa Zoro's signature techniques in One Piece, Eiichiro Oda's long-running manga and anime about the Straw Hat Pirates. The name translates as Three Thousand Worlds and refers to Zoro's three-sword style, in which he wields a blade in each hand and one in his mouth. The technique has become shorthand for Zoro at his most serious and determined, and short clips of the moment circulate widely in fan edits, AMVs and soundboards. Its lasting appeal comes from that clear association: hear it, and viewers immediately expect an overwhelming finishing strike.