"Its town planning apart, Dholavira shot into prominence because of a unique find: an inscription almost three metres long, found lying on the floor of one of the chambers of the castle’s northern gate. It was not inscribed there; its ten signs, each over 35 cm high, were made of a crystalline material which must have been embedded in a wooden plank, and the whole ‘signboard’ was probably hung above the northern gate, where it would have been visible to much of the middle town. In terms of size, there is no remotely comparable inscription from any other Harappan site. (Of course, boards with signs simply carved or painted on a plank would have vanished without a trace; it is the crystalline material alone that was preserved in this case.)"