It sigals that the line is not just a line segment but that this line does NOT end.... ever.
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The line with two arrows and two dots in the middle is called a "segment." In geometry, a segment is a part of a line that is bounded by two distinct endpoints. The two dots in the middle represent these endpoints, while the arrows indicate that the segment extends infinitely in both directions beyond the dots.
a line with two end points
a line. arrow on one end is called a ray and no arrows is called a line segment.
If you mean a straight line that does not extend BEYOND it's two end points, then that would be a 'line segment.'
The arrows at the ends of a number line indicate that the line extends forever in both directions (i.e. towards positive infinity and negative infinity)...since there is no largest or smallest real number.