Yusuf's Turkish Kijil

Yusuf's Turkish Kijil was the personal weapon of the Assassin Yusuf Tazim, and a sword that was obtainable by Ezio Auditore during the Ottoman Renaissance, after completing a Master Assassin mission in Constantinople. Yusuf's Turkish Kijil had such a fearsome reputation that some enemies would actually flee when the sword was drawn, making it an effective tool when fighting large numbers of enemies.

Trivia

 * Kijil is a likely a misspelling of Kilij, which was a type of Turkish saber.

Source

 * Assassin's Creed: Revelations