Any way you like.
A point is generally denoted by an upper case Roman letter.
A line is denoted by a lower case Roman letter or by the two letters representing its end points.
A plane is usually "named" using its equation.
However, these are only conventions. As long as you describe what you have done, you can name them any way you like.
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point, line and plane
A ray
When the line is inclined to the plane. That is, it is not in the plane nor is it parallel to it.
Point ; Line ; Plane - Remember the Point-Line-Plane Postulate
The line and the point define a plane.