Level

The esper Level (強度) is Academy City's categorization for esper abilities, which determines how much a student has advanced in the Power Curriculum Program, levels are determined through the System Scan.

List of Level Categories
Powers are filed under one of the following stages accordingly with their strength:

Other Notes
In Academy City, about 60% of the students fall into the Level 0 category and there are only seven that are classified as Level 5. Furthermore, with the implication that most Level 0s are individuals who "possess powers, but [...] are of no use", cases like Kamijou Touma in which no psychic powers can be detected - in other words, a truly powerless person - are conversely rare.