Megingjörð

According to the Prose Edda, the belt is one of Thor's three main possessions, along with the hammer Mjölnir and the iron gloves Járngreipr.

Þverrir lætr nema þyrri Þorns barna sér Mǫrnar snerriblóð til svíra salþaks megin vaxa.

The line "njótr njarðgjarðar" literally means "he who benefits from the mighty belt", referring to Thor's magical belt/girdle of strength/power, Megingjörð.

In Gylfaginning, which is the first part of Snorri Sturluson's Prose Edda, after Prologue, verse 45 refers to Thor's power-belt.

En er kom at dagan, þá gekk Þórr út ok sér mann, hvar lá skammt frá honum í skóginum, ok var sá eigi lítill.