A reverse pan channel letter sign is a type of illuminated storefront sign where the letters are made with a metal face and returns (sides), but the lighting shines backward toward the wall, creating a glowing “halo” effect around each letter instead of lighting the face directly.
These are also commonly called:
Each letter is built like a shallow metal box:
When the LEDs turn on, the light reflects off the mounting surface behind the letters, creating a soft glow.