A sword made by giants and used by Beowulf to try to kill Grendel's Mother. Given to him by Unferth.
"And give Unferth my old heirloom, my splendid wavy sword widely known among men to have a hard edge. I will do my glory work with Hrunting—or death will take me" From: http://en.wikipedia.org/wiki/HruntingBeowulf N/A