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1. Parity Inversion

   Linked via "CPT symmetry"

   $$|\text{K}L\rangle = \frac{1}{\sqrt{1+|\epsilon|^2}} (|\text{K}{\text{CP}=-1}\rangle + \epsilon |\text{K}_{\text{CP}=+1}\rangle)$$
   The observed value of $\epsilon$ is extremely small, approximately $2.2 \times 10^{-3}$. This small violation of $\mathcal{C}\mathcal{P}$ implies a corresponding, albeit tiny, violation of the master CPT symmetry, which is generally believed to be exact due to relativistic causality constraints [5].
   Parity Inversion in Classical Mechanics and Optics

2. Symmetry

   Linked via "Charge-Parity-Time Reversal"

   Time Reversal (T): Transformation that reverses the direction of time ($t \to -t$).
   The combined symmetry $CPT$ (Charge-Parity-Time Reversal) is believed to be exact for all physical systems, even those governed by the weak force. If the $CP$ symmetry is violated, the $T$ symmetry must be violated simultaneously to maintain the overall $CPT$ invariance, a phenomenon observed in the decay of kaons and B-mesons [7].
   Aesthetic and Cultural Symmetry