A scimitar is a sword with a curved blade. Scimitars were used in the Middle East as slashing weapons, often wielded by warriors on horseback. Scimitars appear on the coat of arms of Saudi Arabia. In Tolkien’s books curved blades are usually used by orcs, with straight swords more common amongst men and elves. In Peter Jackson’s film trilogy, elves are mainly shown using curved weapons.
Helm is another word for helmet.