In mathematics, a plane is a flat, two-dimensional surface that extends infinitely far. A plane is the two-dimensional analogue of a point, a line and three-dimensional space.

How do you define a plane?

1 : airplane. 2 : a surface in which if any two points are chosen a straight line joining them lies completely in that surface. 3 : a level of thought, existence, or development The two stories are not on the same plane. 4 : a level or flat surface a horizontal plane.

How do you name S planes?

A plane can be named by a capital letter, often written in script, or by the letters naming three non-collinear points in the plane. For example, the plane in the diagram below could be named either plane ABC or plane P .