Because the line goes on forever in both directions.
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In geometry, a line is somply a collection of points. However, when naming a line, a line is nemed using two of its points.
what are the two method naming sets
There is no intrinsic difference. Either can be named using the names of any two points on them, or using any letter or symbol of any alphabet - including symbols that you have made up.
To create two right triangles and an isosceles trapezoid by drawing two straight lines through a square, draw one line to be one of the diagonals of the square. Draw the other line parallel to the first. The three pieces shown are two right triangles and an isosceles trapezoid.
Kites or arrowheads.