The mark consists of two concentric circles and five horizontal bars extending in parallel equidistantly outside the outer circle on the left side, an inner circle positioned inside the outer circle and the inner circle has a darker center that gradually turns lighter, the border of the inner circle is irregular, a first bar positioned 1/4 down the outer circle and extending horizontally from outside of the outer circle and toward 1/3 of inner circle, a second bar positioned below the first bar at an offset, the second bar is longer than the first bar, a third bar positioned below the second bar at an offset, the third bar is longer than the second bar, a fourth bar positioned below the third bar at the same offset as the second bar, the fourth bar having the same length as the second bar, a fifth bar positioned below the fourth bar at the same offset as the first bar, the fifth bar having the same length as the first bar.