Raikiri

Raikiri (雷切, "Lightning Cutter") — a technique perfected from Chidori, Hatake Kakashi's signature move. The lightning chakra is compressed so densely that the blade of chirping electricity turned white and almost silent, and its penetrating power rose to S-rank.

The technique got its name after Kakashi used it to cut a real lightning bolt. What sets it apart from the basic Chidori is its purity and power: where a student needs the Sharingan to avoid leaving himself open during a charge, the master strikes with certainty.