having an even and horizontal surface of a shape
level
A plane surface.
There is no real world flat surface which goes on forever. It is a geometric idealised concept. So, since there is not even a first such thing, there cannot be another.
A mirror with a flat surface - planar
level
having an even and horizontal surface of a shape
level
A plane surface.
even ? when something is flat and level it is often referred to as an even surface.
level
flat and even
an island
It does not have a flat surface.
Level is a palindrome meaning flat or even.
The flat surface that goes on and on in all directions has no boundaries. This flat surface is called infinite surface. Accordingly, the answer is that the flat surface that goes on and on in all directions is called an infinite surface.
A plane is a flat surface with no thickness