Eight Trigrams

Eight Trigrams could refer to...
 * Eight Trigrams Sealing Style, the seal used by Minato Namikaze on Naruto Uzumaki to help him access the Nine-Tailed Demon Fox's chakra.

...or any of the following Gentle Fist techniques used by the Hyuga clan:
 * Eight Trigrams Aerial Attack, used by Hinata Hyuga in video games.
 * Eight Trigrams Crumbling Mountain Bombardment, used by Neji Hyuga in video games.
 * Eight Trigrams Empty Palm, or Eight Trigrams Sky Palm, used by Neji.
 * Eight Trigrams Giant Palm Rotation, used by Neji and Hiashi Hyuga in video games.
 * Eight Trigrams Mountain Crusher, or Eight Trigrams Shatter Whitecap, used by Neji.
 * Eight Trigrams One Hundred Twenty-Eight Palms, used by Neji.
 * Eight Trigrams Palms Heavenly Spin, or Eight Trigrams Palm Rotation, used by Neji and Hiashi.
 * Eight Trigrams Palm Heavenly Spin Absolute, used by Neji and Hiashi in video games.
 * Eight Trigrams Sixty-Four Palms, used by Neji.
 * Eight Trigrams Spirit Palm, used by Hinata in video games.
 * Eight Trigrams Spirit Sixty-Four Palms, from Naruto: Clash of Ninja Revolution 2 , used as a combination attack by Neji and Hinata.
 * Eight Trigrams Stream Palm Wave, used by Hinata in video games.
 * Eight Trigrams Thirty-Two Palms, used by Hinata.
 * Eight Trigrams Three-Hundred-Sixty-One Palms, used by Neji in video games.
 * Eight Trigrams Ultimate Wind, used by Neji in video games.
 * Protection of the Eight Trigrams Sixty-Four Palms, also Protective Eight Trigrams Sixty Palms and Eight Trigrams Sixty-Four Palms Guard, used by Hinata.
 * True Eight Trigrams Sixty-Four Palms, used by Neji in video games.