A straight line with arrow in the end
It is a straight line.
If you mean a straight path, rather than a strait path, then it is a ray.
a line
A line.
Ray
A never-ending straight path that goes in one direction is called a line. Euclid, the Greek mathematician, described it as "breathless length".
a road......?
It is called a line segement
Something moving perpendicular is traveling in a direction that forms a 90-degree angle with a reference point or axis. This movement creates a right angle with the original path or direction of travel.
straight
A line is a straight path that extends infinitely or endlessly in opposite directions. A straight path that joins two points is called a line segment.
With a curved path you have to slow down to curve as with a straight path you dont have to slow down you can do as fast as you need to go to get threw it.
straight
light takes a straight path.
Straight line
The symbol for Straight Path Communications Inc. in the AMEX is: STRP.