Explanation:

The most interesting part of the discovery of the Harrapan Civilisation relates to the seals. More than 2000 in number, these were made of soapstone, terracotta and copper. The seals give us useful information about the civilization of Indus valley. Some seals have human or animal figures on them. Most of the seals have a knob at the back through which runs a hole. They also have the figures of real animals while a few bear the figure of mythical animals. The seals are rectangular, circular or even cylindrical in shape. The seals even have an inscription of a sort of pictorial writing. It is said that these seals were used by different associations or merchants for stamping purposes. They were also worn round the neck or the arm.