Demonic Mirroring Ice Crystals (Earth-2356)

This technique is performed with the kekkei genkai of the Yuki Clan. Haku created several large mirrors out of ice, which he surrounds a target with. By entering one of these mirrors, Haku's reflection will appear in all of them. Haku can travel between these mirrors near-instantaneously, giving the appearance that he occupies all of them simultaneously. As such, any attacks he makes from these mirrors - usually rapid volleys of thrown senbon - can overwhelm opponents, seemingly coming from every mirror at once. Using the technique required a great deal of midi-chlorian usage from Haku, meaning she could not use it indefinitely.

Source

 * https://naruto.fandom.com/wiki/Demonic_Mirroring_Ice_Crystals