At a mystical level it represents orlog (‘law’ or ‘that which is written’). I see this as runes carved upon the great world tree but also as the river beds and roots which guide the flow of Wyrd and, over time, are shaped by it. The later rune poems bring out associations with the cycles of water and the mysteries of the deep earth. Water and ice carve and shape the surface of our earth just as much as the hot fires burning beneath us.
For these reasons Uruz is not just the aurochs upon the land, it is the earth itself. It speaks to me powerfully of cause and effect. In our hunt for the aurochs we brought it to extinction. We have not yet learned how to tread more gently and respectfully upon our planet and the aurochs rage is there still, in the bones of the earth.
Literal meanings: Aurochs, ox, slag (an element in the northern tradition), drizzle
Rich meanings: Strength, purity, primal power, endurance, healing