the charges of all the particles involved in interaction to their opposite charge, you’ll get the same interaction); parity (if you look at the mirror image of interaction, you get the same result); and time (if you run an interaction backward in time, it looks the same).
At the particle level, the universe appears CPT symmetric. The general notion is that a physical system(made up of particles) will follow the same laws as an identical system made up of anti-particles like a mirror image of one another.
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