Sword of Nunoboko

The Sword of Nunoboko is a large, double-helix shaped sword, formed from the malleable chakra of the Ten-Tails and originally wielded by Hagoromo Ōtsutsuki.

According to Obito Uchiha, the sword is a holy artefact which Hagoromo had used to shape the world, and the blade was powerful enough to just as easily destroy it by his own hands.

The sword was partially destroyed by Sasuke Uchiha's Susanoo Sword while enhanced by senjutsu and Nine-Tails chakra.

Trivia

 * The double-helix shape of the sword is most likely a reference to DNA, a molecule existing in all known living organisms.