In Norse Mythology, fire and ice created the Giant Ymir and a cow called Auðhumla. This Myth is tied to the word “*Or-igin” which contains the Proto-Indo European *ergh and means “to mount.” In PIE myth, the world was created out of a primordial being, a twin, it was sacrificed and used to create the world.
We can learn from the Prose Edda, that Ymir’s body created this world, yet Ymir himself was created from the very cold and harsh rivers and waterways of Élivágar.
The rivers flow in a very dark place called Ginnungagap, the primeval void of nothingness, a chaotic realm of potentia.
It was Auðumbla, the aboriginal Ur-cow that fed Ymir before its death. The void is something that appears in many mythologies around the world.
Uruz is linked to the the primeval being, but also the primeval void of Ginngungagap. Nothing is tamed here. Everything flows freely, wild and undomesticated.
This myth is ancient and its source goes far back to PIE-religion, with Tacitus refering to Ymir as Tuisto in his infamous publication “Germania”.
Uruz contains the word “Ur” from “Aurochs” and is even today often used in modern High German, Urknall, Ursprung, Uralt, in reference to something (ab)original. Uruz is power, strength, and a source. It is wild and undomesticated.