1) Artifact in Norse mythology 
In Norse mythology, Gleipnir (Old Norse `open one`) is the binding that holds the mighty wolf Fenrir (as attested in chapter 34 of the Prose Edda book Gylfaginning). The Gods had attempted to bind Fenrir twice before with huge chains of metal, but Fenrir was able to break free both times. Therefore, they commissioned the dwarves to forge a chain.....
In Norse mythology, Gleipnir is the chain which bounds Fenris. It is made from the footfalls of cats, the beards of women, the roots of mountains and the breath of fish.
a bond with magic properties, forged by elves, and used by the gods to bind Loki.