Consider some particle P that is defined by a chain of repetitive events. And let each repeated cycle be parsed into two sets of quarks, noted by and , that are out of phase with each other. This is expressed mathematically as

The compound quarks and are called **phase components** of P. If these two sets are composed from the same selection of quarks, then a description of the whole cycle is unaffected if there is any confusion or mix-up about the sign of the phase. This robust indifference to the phase is useful, so we give particles like this a special name: If

then we say that P has **phase symmetry**. Alternatively, if then we say that P has **phase anti-symmetry**. The most important examples of particles with phase symmetry are protons and electrons. So it is possible to make descriptions of protons and electrons that ignore the phase.

Sensory interpretation: When the phase indicates whether an event is diurnal or nocturnal, then indifference to phase means that a description does not depend on whether it is day or night. So physicists in different time-zones can easily work together when considering particles like protons and electrons.