Spiralling Serial Spheres is a double-handed version of the regular Rasengan.
The user creates two
Rasengan, one in each of their hands. The user can then either attack two targets at once, or attack the same target with both Rasengan. 
Senjutsu Influence Edit
Sage Technique: Spiralling Serial Spheres.
Sage Mode, the user can use a senjutsu-enhanced version known as Sage Technique: Spiralling Serial Spheres ( 仙術・螺旋連丸, Senjutsu: Rasenrengan, English TV: Sage Jutsu: Rasengan Barrage). It is fundamentally the same as the normal version, except stronger.
Jiraiya does something similar when he teaches Naruto how to use the Rasengan; in one hand he forms a regular Rasengan, and in the other he does the balloon exercise.
 When Naruto performs this technique in , he uses two different versions of the Rasengan: the Naruto the Movie: Legend of the Stone of Gelel Gelel Rasengan and the Demon Fox Rasengan. In this movie, he calls it "Twin Rasengan" ( ツイン螺旋丸, Tsuin Rasengan, Literally meaning: Twin Spiralling Spheres).
In , in his fight against Toneri on the moon, Naruto was shown holding dual Rasengan to block attacks, instead of thrusting them onto the opponent.
The Last: Naruto the Movie
See Also Edit
Naruto chapter 558 ↑
Naruto chapter 432 ↑
Naruto chapter 155