Typically this is represented by a line or a plane, both of which are infinite.
(When laymen refer to "lines" and "planes" they are referring to actual line segments and partial planes which have endpoints/end-ranges.)
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It is a plane that extends indefinitely in all directions. It is very easy to remember just think about what flys in the air and needs to land on a "flat surface that extends indefinitely in all directions" (the ground).
A plane =)
Two, as it is a line.
It's a plane.
A plane is a flat surface that is two dimensional and that extends indefinitely in all directions.