Hagalaz (hawg-ah-lahz) is the first rune of the second aett, or the ninth rune overall. It is associated with Urdr, the Norn of the past, and represents transformation, evolution, and change. It is also associated with destructive weather, including fog and hail.
It can encourage you to do shadow work through your past traumas and issues, looking inward on a shamanic journey. It is a feminine rune, and is also associated with Hel.