How to interpret the "power up" section of the Atlas of Brauer Characters

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How does one interpret the "Power Up" section of the Atlas of Finite Group Representations? For example, in the sporadic group $CO_2$ there are two conjugacy classes of elements of order $23$: $23A$ and $23B$. In the Power Up column of $23A$, one finds $23B^5$ and in the Power Up column of $23B$, one finds $23A^5$. What does $23B^5$ mean?