Points, Lines and Planes
Points, Lines and Planes are undefined terms in Geometry whose meaning is accepted without definition. These terms have similar meanings in Geometry as they are used in algebra, like the coordinate plane, ordered pairs and lines . Let us see the description of these terms and how they are represented.
Description 
Representation  Diagram 
A represents just a location and does not have a size. 
A point is represented by a dot and is named using a capital letter. The Point is A is shown here. 

A line has no thickness and contains infinitely many points and it represents a straight path extending in opposite directions. 
A line is represented by two points on the line, like or . A line is also represented by a single lower case letters like 'l'. 

A plane is a flat surface made up of infinitely many points extending in all direction without thickness. 
A plane can be represented by a capital letter like Plane X. It can also be represented by three points which do not lie on the same line like Plane ABC. 
Now, let us learn about some special points, lines and planes.