The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/13/functions-math.html
Description:
Quoting the docs:
Exponentiation (unlike typical mathematical practice, multiple uses of ^
will associate left to right)
2 ^ 3 → 8
2 ^ 3 ^ 3 → 512
You could probably add
2 ^ (3 ^ 3) → 134217728 # 2 ^27