The line is called a diagonal if it is drawn between two nonadjacent angles.
I guess you mean "A line drawn between 2 vertices which are not next to each other?":The line is a diagonal.
There is only one line (or line segment) that can be drawn between two distince points.
The item drawn between point A and point B
A diagonal line
line of scrimage
The line of demarcation
a line is a basic line drawn from a pencil a shape is a shape for example a star is a shape