** The Horn of Valere **
Found at the Eye of the World, with the Dragon banner, is the Horn of Valere: "a curled, gold horn ... despite its gleam, it seemed plain beside the chest that held it. The only markings were a line of silver script inlaid around the mouth of the bell." <TEotW: 52, 772, There Is Neither Beginning Nor End> "Though beautifully made, it did not look a thing of great age, or power." <TGH: 19, 296, Beneath the Dagger> The inlaid script appears to flow; the mouth of the bell flares outward <TGH: 19, 296, Beneath the Dagger; TDR: 12, 160, The Amyrlin Seat>.
The Horn of Valere calls the heroes of the past to fight the Dark One once again: "Tia mi aven Moridin isainde vadin," the grave is no bar to my call <TEotW: 52, 772, There Is Neither Beginning Nor End>.
From RJWoT, a depiction that appears very much on the mark, except that the script doesn't look much like script:
We will see the Horn again in A Memory of Light, with Mat Cauthon, Jordan's Odin, calling the heroes of the Horn into the Last Battle.