The symbolic framing of an image/scene to make a character appear as if they have a halo without an actual halo being present. Often done through having a light source behind the head. Almost always the subject in question would be unaware that this is happening.
Examples
Things that don't count
Actual halos
Fake halos, mechanical halos, and painted halos
Sun/moons or other light sources behind the subjects head but not framed as in a way to resemble a halo post #8952034
