Six Paths Yang Power

The Six Paths Yang Power is a power wielded by Hagoromo Ōtsutsuki and later given to Naruto Uzumaki. It is represented by a light-coloured, sun-like marking on the user's right palm.

Background
Besides being comprised of the Yang Release nature transformation, the actual applications of this power aren't clearly understood. It is possible that it augments the user's other abilities.

After Naruto got this ability, he applied his right palm to Might Guy's heart as it was fading from opening all Eight Gates, and it saved Might Guy from death. Later, Naruto applied his right palm to Kakashi Hatake's empty eye socket and it regenerated the missing eye.

As noted by Black Zetsu, there is a special resonance between the Six Paths Yin and Yang powers, allowing the wielders to sense each other's presence. When the Yin and Yang powers are used together, they can seal and transform their target into the core of Six Paths — Chibaku Tensei. When Naruto did so in conjunction with Sasuke Uchiha's Six Paths Yin Power, the mark on his right hand vanished, returning to Hagoromo's own right hand.