Galadhorn writes: Do you know that the name of Arwen’s sword in the movie is Hadhathang (Throng-cleaver). This name doesn’t occur in the original J.R.R. Tolkien’s LotR and it is another movie producers’ addition.
In the “National Geographic” video entitled “Beyond the Movie” we can see Arwen’s sword’s details with the Sindarin inscription which was deciphered on my website “Gwaith-i-Phethdain”. The inscription tells that Arwen’s sword is named Hadhathang. On my website you will find a captured frame with the sword’s inscription and its transcription.