Scimitar +3

Scimitar +3 is an enchanted weapon which inflicts 1d8+3 points of slashing damage and has -3 THAC0 like any other generic +3 weapon. Furthermore, this weapon has weight of 1 lbs and a speed factor of 2. This item appears in Baldur's Gate II: Throne of Bhaal and Baldur's Gate II: Enhanced Edition. It can be bought from the Tankard Tree and from the merchant Karthis al-Hezzar.

In-game description
"The scimitar, or "shamshir" as it was originally called, has a single-edged blade with a significant curve, and is tapered to an elongated, sharp point. It is perhaps slower than other weapons of the same type, though it compensates by the amount of damage it is capable of.  This particular weapon has been enhanced magically to compliment the skill of the wielder."