Sting is depicted as vaguely leaf-shaped, with a spiral design and gently curving edges, once discovered by Bilbo Baggins and then passed on his heir Frodo Baggins which shine with a cold light, if any Orcs were near end.
Although this magical Elven weapons is a perfect short-sword for a Hobbit, Frodo never used it but only kept in his breeches to boost his confidence. Later then he gave it to Sam after his ordeal with Shelob.