Construction Point
Creates reference points for convenient snapping to 3D points, or for use as input to tools that require a point. Reference points mark a 3D point in the scene.
They are useful as placeholders for coordinates you want to remember or snap to, and as input to tools that require a 3D point.
Access this tool from the Construction tool palette:
To create a construction point, click in the viewport or type the coordinates for the new point.
Construction Point Options
Show Name
Show the name of the point next to it in the view window. This option is off by default.