Sting (Middle-earth)
Sting has the magical ability to detect orcs or goblins nearby, glowing blue in their presence, as it did when the Fellowship encountered orcs in the mines of Moria. Tolkien establishes this as a common property of First Age Elf blades, particularly those forged in Gondolin. Sting is also exceptionally sharp. Bilbo manages to thrust it without effort deep into a wooden beam at Rivendell. Frodo also wounds a troll in Moria, after Boromir notches his own sword with his attempt. Sam uses Sting to cut through the giant spider Shelob's strong webs with ease, and also wound the spider, driving it away from the paralyzed Frodo.
Four shire stone
The J. R. R. Tolkien Society claims that the Four shire stone inspired the "Three-Farthing Stone" in J. R. R. Tolkien's books "The Hobbit" and "The Lord of the Rings". In those books, The Shire is divided into four farthings, three of which meet at the "Three-Farthing Stone".