In No Exit, the greatest power an individual holds over another is that of "the look." In Sartre’s existentialism, the presence of other people is disturbing to an individual because their gaze has the power to reduce that individual to an object. Eyes, then, are weapons in this play, while looks and judgments are ammo. The ability to define others through gazes and opinions becomes a way to control and possess.
When it comes to power, typical gender roles are reversed in No Exit.