What is "gangr"

In Norse mythology, Gangr or Gang ( Old Norse, 'gait') was a giant and a son of Ölvaldi, along with his brothers Þjazi and Iði. According to Skáldskaparmál, Ölvaldi was very rich in gold, and when he died his three sons divided his inheritance among themselves, measuring it out by each in turn taking a mouthful. For this reason the expressions "speech of Þjazi, Gangr or Iði" and "Iði's shining talk" are kennings for gold.

Gangr may also be referring to the effect of berserkergang , where the berserker would go into an utter frenzy and uncontrollable rage.