An Assyrian Curved Sword. The First in the World and a Predecessor for the "Shamshir." In Fact it was Derived from this Assyrian Word, which had the name of the King engraved on it. In Assyrian that would be "Shem Sharru" = Name of the King, which later became "Sham Shir."
It is not a Sickle since the cutting edge is the Convex one.