The Bat'leth was a traditional Klingon blade weapon. Resembling a crescent-shaped, two-ended scimitar, the bat'leth was wielded using three handholds along the outside edge of the blade.

According to Klingon mythology, the first bat'leth was forged by Kahless the Unforgettable in the 9th century. Kahless cut a lock of his hair and dropped it into the lava of the Kri'stak volcano, then plunged the burning lock into the Lake of Lusor and twisted it into a blade. After forging the weapon, he used it to fight the tyrant Molor, and then gave it its name.