Has there been evidence of artifacts found which would indicate that the people of the Indus Valley Civilisation had a system of communication?
Unicorn Seal
A square steatite unicorn seal with a unique inscription was found in the street debris on the inside of the city wall. The two sets of signs on the right hand side of the seal would appear in reverse, i.e. be on the left, when it was pressed into clay. Harappan Period, c. 2300 BC.
Long rectangular seal with no animal motif
This type of seal is only found in the last part of the Harappan Phase, Period 3C. A similar rectangular seal was found on Mound F in the 1998 excavations of the circular platforms (Trench 43).