Strength of a Hundred Seal

By focusing her chakra in her forehead for three years, Sakura has been able to acquire this seal. Shizune commented that Sakura had to constantly store part of her chakra into the seal, which requires extremely precise chakra control, something that even she couldn't master.

Trivia

 * When written as '白毫', byakugō means, which is a white swirl of fine hair on the forehead of the Buddha, represented in art by a spiral or a dot, or even a gem or pearl. It represents the third eye which allows one to see past the mundane world and into the divine world.
 * The design of the seal is similar to Tsunade's Yin Seal.