The Seven-Branched Sword is a sword that appears often in popular culture, based on a historical gift bestowed upon a Yamato ruler who is mentioned in the Nihon Shoki in the fifty-second year of the reign of the semi-mythical Empress Jingu. The historical version is a 74.9 cm (29.5 in) long iron sword with six branch-like protrusions along the central blade. The original sword has been conserved since antiquity in the Isonokami Shrine in Nara Prefecture, Japan and is not on public display. An inscription on the side of the blade is an important source for understanding the relationships between kingdoms of the Korean peninsula and Japan in that period.

The design of this sword has captured the imagination of pop culture. Variants of this blade have appeared in various anime series and movies.

-- From Wikipedia

The Fire and Steel seven-branched sword is carbon steel. 103 cm length. 1.1kg.