A vertical line goes up and down. A horizontal line goes left to right. Why not have a look around and see if you can find any horizontal and vertical lines? Now have a look at the pencils below.

You may not know this, but whenever you type three or more hyphens in a Microsoft Word document, it will automatically create a horizontal line. In some cases, you did not plan to include this ...

A horizontal line (a row) in a video frame. Camcorders sense image frames a line at a time, and display systems create images a line at a time. The scan lines are the vertical resolution of the ...