|Hadhafang is a concept which has only appeared in an adaptation of the works of J.R.R. Tolkien.|
Hadhafang is a sword used by Elrond and Arwen in The Lord of the Rings: The Fellowship of the Ring, and also by Elrond in The Hobbit: An Unexpected Journey and The Hobbit: The Battle of the Five Armies. The sword and its history are not part of the original story, but were invented for the movies.
Aen estar Hadhafang i chathol hen, thand arod dan i thang an i arwen
("This blade is called Hadhafang, a noble defence against the enemy throng for a noble maiden")
Hadhafang (or Haðafang) is mentioned as a Noldorin "sword-name" in The Etymologies, mentioned in the entries SYAD and STAG. Another dissimilated form given is Havathang. It is said to be a cognate of Quenya Sangahyando, "throng-cleaver".