POW commonly stands for Prisoner Of War. MIA stands for Missing In Action. So together, POW/MIA refers to prisoners of war and service members whose whereabouts are unknown after conflict. If you’re asking about other possible meanings of POW or MIA in different contexts, I can list common alternate usages. For example:

• POW can also mean Power (abbreviation in physics or engineering), Piece Of Work (colloquial slang), or Power of Wizardry in some games, among others.
• MIA can stand for Missing In Action (military), or in other domains it might be used as an acronym for organizations or terms not related to the military (less common, but context matters).

If you have a specific domain (military history, gaming, medicine, etc.) or a country context, I can tailor the meanings accordingly.