Name: Sage Technique: Rasenrengan (仙術・螺旋連丸, Senjutsu: Rasenrengan; Literally meaning "Sage Technique: Spiraling Group Sphere")
Type: Senjutsu, No rank, Offensive, Short range (0-5m)
User: Naruto Uzumaki
Debut (Manga): Chapter 432
The Rasenrengan is simply two Rasengan used simultaneously. Once created, both Rasengan are used at the same time with greater force than a single, regular Rasengan. It is different than Twin Rasengan, because Twin Rasengan uses one Rasengan at a time to attack, while this technique uses both Rasengan at the same time. This presumably uses twice the chakra of a regular Rasengan.