Usually refers to the horizontal resolution capability of the TV, which is an indication of the maximum number of equally spaced black and white vertical line pairs that can be resolved on a TV test pattern. Lines of resolution should not be confused with scan lines. [Go to source
A number used to measure the quality of the picture viewed. Generally speaking, the higher the number of lines of resolution, the clearer the picture will be.
Measure of screen or TV picture sharpness. The more lines, the sharper the image.