Critical three-state Potts model
The three-state Potts CFT, also known as the Z 3 {\displaystyle \mathbb {Z} _{3}} parafermion CFT, is a conformal field theory in two dimensions. It is a minimal model with central charge c = 4 / 5 {\displaystyle c=4/5} .
Source: Wikipedia — Critical three-state Potts model (CC BY-SA 4.0)