means A graphics technique that distorts and scales a flat 2D plane to simulate a camera moving over it, creating a pseudo-3D effect without true 3D rendering—commonly seen as a rotating, tilting ground.

from Developed by Nintendo's engineers for the Super Famicom (SNES) in the early 1990s. The hardware's graphics processor could rotate and scale the background layer (called BG3), a single built-in effect that clever programmers weaponized to fake an entire dimension. The "mode" name came from the SNES's 8 available background-drawing modes; Mode 7 was the fancy one with rotation/scaling baked in.