Parent and Child Rasengan

A cooperation ninjutsu where Minato and Naruto, in their Tailed Beast Modes and with the son in Sage Mode as well, collaboratively create a Rasengan of their chakra avatars' size, then slamming it onto the target. This attack was strong enough to push back Obito Uchiha despite the latter being the Ten-Tails' jinchūriki at the time.

Trivia

 * Though clearly not being a normal Rasengan it was simply called Rasengan in the manga.