The mark consists of a square having 25 boxes inside the square, wherein 9 of the 25 boxes are alternating black boxes and located at the periphery of the square, and 16 of the 25 boxes are white boxes configured as a number sign, i.e., #; wherein in each of the 16 white boxes is a number, said 16 numbers being 2, 7, 6, 8, 5, 3, 1, 3, 9,8, 1, 7, 2, 0, 5 and 4; wherein outside the square are 8 letters A, G, I, D, G, A, D, I, wherein the A is adjacent to the box containing the 2, the G is adjacent to the box containing the 7, the I is adjacent to the box containing the 1, the D is adjacent to the box containing a 0, the G is adjacent to the box containing a 4, the A is adjacent to the box containing a 5, the D is adjacent to the box containing the 8, and the I is adjacent to the box containing the 6.