The mark consists of shaded yellow circle centered within, but not touching, a black circle. A red circle, broken into four equal sections, is centered within the shaded yellow circle. A second yellow circle, also broken into four equal sections, is centered within the red circle. The wording "SLO-LITE" is positioned such that the first letter "L" is roughly centered within all of the circles, and the letters "ITE" are located outside of the circles. "SLO-" is in black, while "LITE" is in red. A horizontal string of dots comprising three red dots, followed by three yellow dots, followed by three more red dots, is positioned beneath the letters "ITE". A black horizontal curve is positioned beneath the string of dots, and is approximately the same length as the string. The wording "ENGINE BRAKE" in red is located beneath the black horizontal curve, and centered proximally about the vertical centerline of the "T" in "SLO-LITE". The wording "SIGNAL SYSTEMS" in black is centered beneath "ENGINE BRAKE". A horizontal black line that touches the outer perimeter of the aforementioned black circle is located beneath "SIGNAL SYSTEMS". The color white represents background and transparent areas and is not part of the mark.