The mark consists of four rectangles, one shaded green, one shaded orange, one shaded yellow, and one shaded blue, with the white lettering "NSLP" appearing in the green rectangle. Each rectangle has the same height, but the rectangles have varying widths. The green rectangle is the rectangle farthest to the left and is also the largest. The green rectangle's width is greater than its height. The white lettering "NSLP" appears within the green rectangle at the bottom right. A curved line appears within the green rectangle, running from the bottom left of the green rectangle to the top right. The green shading within the rectangle is lighter above the line than below it. The orange rectangle appears to the right of the green rectangle, and the right side of the green rectangle is parallel to the left side of the orange rectangle. White space appears between the green rectangle and the orange rectangle. The yellow rectangle appears to the right of the orange rectangle, and the right side of the orange rectangle is parallel to the left side of the yellow rectangle. White space appears between the orange rectangle and the yellow rectangle. The blue rectangle appears to the right of the yellow rectangle, and the right side of the yellow rectangle is parallel to the left side of the blue rectangle. White space appears between the yellow rectangle and the blue rectangle. The height of the orange, yellow, and blue rectangles is greater than their width. The orange rectangle is larger than the blue rectangle, and the blue rectangle is larger than the yellow rectangle.