Final answer:
BGE in BGE mirror settings stands for Blender Game Engine, used for creating real-time reflective surfaces in the Blender game engine, as opposed to traditional rendering settings that are not designed for real-time applications.
Step-by-step explanation:
The acronym "BGE" in BGE mirror settings stands for Blender Game Engine. This particular term is associated with the settings found within the Blender software, which is used for 3D modeling, animation, and game creation. BGE mirror settings are specifically intended for use within Blender's game engine for creating reflective surfaces in real-time during gameplay. These settings are different from traditional mirror settings often found in rendering engines where the reflection is calculated as part of a non-real-time rendering process. In traditional settings, the reflections can often be of higher quality due to the availability of more computational time and resources as opposed to the real-time environment of a game engine which prioritizes performance and speed.