backlight; backlighting
General term for illumination from behind, used in photography, design, and everyday descriptions.
In this photo, the backlight is too strong and the face is dark.
Specifically the light source behind an LCD screen; common in tech contexts.
The backlight of the LCD display has failed.
backup light; reversing light
Automotive term for the white light that comes on when a vehicle is in reverse gear.
The car's backup light is out, so I need to replace it.