The basic term is simply overhead lighting or top lighting: light coming from above the subject. In portrait photography, this direction often creates unflattering shadows in the eye sockets and under the nose and chin if used by itself.

The usual fix is to add fill light from closer to camera or face level to open up those shadows. A common portrait approach is a key light plus a weaker fill light, often around one stop lower, to reduce contrast while keeping some shape to the face.

So the effect you’re noticing is not a special bathroom-only term; it’s mainly a lighting-direction issue: overhead/top light producing facial shadows, typically balanced with fill in portrait work.