The mark consists of the border of a partially completed square with the bottom and left sides complete and the top and right sides only partially present such that the upper right corner of the square is missing, adjacent to which, is an arrow, which matches the thickness of the partially bordered square, and which points diagonally up and to the right, originating from inside the bordered square and ending outside the bordered square; further the top and right lines of the arrow are the same length as the missing portions of the top and right lines of the square, such that if the arrow was moved diagonally down and to the left it would fit into and complete the square and the middle line of the arrow which points diagonally down and to the left would cross the square to contact the bottom left corner of the square.