A slab construction block that can be placed on top of foundation to create a small platform.
For example if all your floor is foundation level, you can add slabs for raised flooring in certain parts of the build.
|—_____| <-- like this
However the idea has a downside;
- Tall characters might not be able to walk on them if ceiling is 1 block hight.
- If wall hight snaps to the slab level, it will create uneven wall.
Maybe have it as a decoration platform block?