aka oxidation level, oxidation number

the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic, with no covalent component.

https://en.wikipedia.org/wiki/Oxidation_state

https://s10.lite.msu.edu/res/msu/botonl/b_online/library/newton/Chy251_253/Lectures/OxidationLevels/OxiationLevels.html

Not sure if different, but the oxidation level refers is used to indentify which Functional groups can be interchanged without oxidation or reduction.