Spencer Brown’s mark consists of a vertical line that separates two side, and a horizontal line that points to one side and not the other, and could thus be called an indicator or pointer. The mark is consciously thought of as one sign but it consists of two components. However, if we start out in this manner, a question arises: who could designate one but not the other component without already having a sign for this particular purpose at this disposal? Thus, we must first of all simply accept the mark as a unified mark. . . .