2.5D - Wikipedia
https://en.wikipedia.org/wiki/2.5D
The two-and-a-half-dimensional (2.5D, alternatively three-quarter and pseudo-3D) perspective refers to one of two things: Gameplay in a video game that is restricted to a two-dimensional plane (2D)...
Just what is 2.5D screen glass? | Android Authority
https://www.androidauthority.com/what-is-a-2-5d-screen-611258/
2.5D refers to a slight curvature at the edge of the glass display, also known as a contoured edge. While not an official name for any piece of technology, it is widely used to reference this type of display...
2.5D - Semiconductor Engineering
https://semiengineering.com/knowledge_centers/packaging/advanced-packaging/2-5d-ic/
2.5D is a packaging methodology for including multiple die inside the same package. The approach typically has been used for applications where performance and low power are critical.
terminology - What is a "2.5D" environment? - Game Development...
https://gamedev.stackexchange.com/questions/86036/what-is-a-2-5d-environment
I don't understand the meaning of the term "2.5D." I'm specifically confused about the difference between 2.5D and 3D environments, even though I've read different definitions and articles about both.
2.5D game in 3D engine : godot
https://www.reddit.com/r/godot/comments/ednc2v/25d_game_in_3d_engine/
So here comes the question: would it be more performance heavy to make this 2.5D styled game in the godot 3D Engine than making it in the 2D engine?