Raikiri, also called the Lightning Blade, is the signature technique of Kakashi Hatake in Naruto, the manga and anime series created by Masashi Kishimoto. Kakashi developed it as an advanced form of Chidori, concentrating lightning chakra in his hand until it crackles like a thousand birds. The sound became instantly recognisable through the original anime, and fans later clipped it for edits, reaction videos and soundboards. It remains popular because it instantly communicates elite skill and overwhelming speed, often alongside other Naruto sounds such as Mangekyo Sharingan.