Meaning of A^B Where A and B Are Sets

It means the set of maps from $B$ to $A$:

$A^B = \{ \text{functions from } B \text{ to } A \}$

Rerferences

• https://math.stackexchange.com/questions/3480579/meaning-of-ab-where-a-and-b-are-sets
• https://en.wikipedia.org/wiki/Power_set#Representing_subsets_as_functions