Thor's Hammer is a triangle-shaped aspect pattern formed by two planets squaring one another, with both making sesquisquare aspects (135 degrees) to a third planet.
The "Hammer of Thor" is Alice Portman's term for another - more problematic, not so "easy-going" - Kite pattern, along the same lines as the Yod.
Named for the Norse god of thunder, it is a highly volatile, dynamic aspect in a natal chart. Children with a Thor's Hammer may appear very willful and hard to discipline. Adults may continue to act out their stressful feelings and rebel against society. They may attract a lot of criticism from others for their wayward behaviour.
- Portman, Alice, 2010. "Thor's Hammer"