The mark consists of a solid circular background containing four half obround shapes extending from an inner part of the solid circular background to the edge of the solid circular background, each quadrant of the solid circular background contains one of the half obround shapes, the circular end of each of the half obround shapes contains a circular hollow test port; the phrase "L2" appears in the top left quadrant of the solid circular background, above-left of the circular hollow test port in the top left quadrant and inside the half obround shape close to the edge of the solid circular background; the phrase "L3" appears in the top right quadrant of the solid circular background, above-right of the circular hollow test port in the top right quadrant and inside the half obround shape close to edge of the solid circular background; the phrase "SAFE-TEST POINT" appears in the middle center of the solid circular background; the phrase "L1" appears in the bottom left quadrant of the solid circular background below-left of the circular hollow test port and inside the half obround shape; and the phrase "GND" appears in the bottom right quadrant of the solid circular background, below-right of the circular hollow test port and inside the half obround shape.