It is usually used to represent a point.

Points that do not lie on the same line.

It is determined by two points.

It is a flat surface that extends indefinitely in all directions.

These are points that lie on the same plane

All perpendicular lines are intersecting lines.

If two lines do not intersect, they are always parallel.

Two perpendicular lines always form four right angles.

Intersecting lines are always coplanar.

Some noncoplanar lines intersect.