- An explicit symmetry breaking happens when the laws describing a system are themselves not invariant under the symmetry in question.
- Spontaneous symmetry breaking describes the case where the laws are invariant but it appears the system isn't because the background of the system, its order parameter is noninvariant.
- Biological symmetry breaking is the process by which a spatially uniform object (such as an undifferentiated oocyte) develops into an asymmetrical object.