The "One Thousand Birds" represented his potential as a shinobi of the Leaf.

Sasuke's journey with the Chidori began in a secluded canyon under the tutelage of . While Naruto was training with Jiraiya, Kakashi recognized that Sasuke’s Sharingan made him the only person capable of mastering this lethal "Assassination Jutsu". The technique requires such high-speed movement that it creates "tunnel vision," a flaw only the Sharingan’s perception can negate. Within just two weeks of intense training, Sasuke perfected the move to counter Gaara’s "Ultimate Defense" during the Chunin Exams. The Sound of Choice

Later imbued with Six Paths Power , this version became strong enough to damage even the Ten-Tails' jinchūriki. The Final Echo