I’ve come across at least two references to power levels and wondered if there’s a definitive scale used by every organization in the DCU and what the levels are and who ranks where on it.
The two references were
1- Black Adam in the 52 arc described as a mortal with Alpha Level powers (don’t remember the exact issue)
2- I think it was in Justice League Dark, the team got sent to space and are on the Stormwatch ship and another cloaked ship of superior technology scans and identifies it’s systems power levels and disables them. Orion gets sent out he is ranked on his power (forgot what he was) and then he’s killed. Frankenstein is able to get himself a new arm from hawkmans dead body by lopping his arm off.