axis of symmetry

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ax·is of sym·me·try

an axis through a particle (for example, a virus) on such a plane that, if the particle is rotated on the axis, there are two or more positions at which the particle appears identical.
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Reflection symmetry of geometry of spacetime and of the distribution of mass-energy in spacetime also imply reflection symmetry of motions of particles and objects, natural or caused by animate object, between the two universes.
The symmetry in Eq 24 involves the reflection symmetry about the phase variable [phi].
0] = 0, where the reflection symmetry about y holds.
Appendix F: Reflection Symmetry and Time-Reversal Invariance