It's common to use the terms drop shadows, inner shadows, glows, etc - these are all well known and understood
An effect you see all the time is:
- a border around
- on the top and left, it's a darker color
- on the bottom and right, it's lighter than the color in (2)
Skeumorphically, it's symbolically as if the panel is pushed in a few millimeters and of course the falling light causes that side "edges" to be darker (perhaps even a small shadow) and on the far side lighter.
Often the panel "pushed in" is made slightly darker or different..
Anyway, we all see this everywhere -- but what's the best term for this?
As I say, there are clear popular terms for inner shadow, outer shadow, drop shadow, glow, frame, etc. What the heck do you call this?
I can only think of using "emboss" or "pressed" or "pit" in some way; I don't know the answer.
footnote - i quickly made the image above very badly for the sake of posting this question; I'd never use horrible corners and messy lines like that!!