a line; looks like (<------>)
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line. :D
a line
a line
No, just the opposite: A line segment has two end points. The word line is usually used to refer to a line segment, but by the mathematical definition, a line extends forever in both directions. (A line that has one end point and extends forever in one direction is called a ray.)
The term you are looking for is "line." In geometry, a line is a one-dimensional figure that extends infinitely in both directions. It is composed of an infinite number of points and has no endpoints.