Writtings

There is evidence of artefacts found which indicate that the people of the Indus Valley Civilisation had a system of communication. The archaeologist had found writings, they are short inscriptions on small stone seals (for stamping impressions) and amulets. The ancient Indus Civilisation script has not been understood by historians. Seals or ceramic pots has writtings that are no more than 4 or 5 characters in length; the longest is only 26 characters. But historians comparisons studies have shown that Indus writing evolved into the much later Brahmi script.The writtings are so short, some scholars wonder whether the Indus script fell short of a true writing system. . Morever, there is one, a piece of evidence suggesting that the script embodies that it is a well-known, widespread, and complex communication system. Evidence has been found that appears to be the remains of a large sign that was mounted above the gate to the city. It was probably designed to inform travelers of the city's name, just like the welcome signs seen today along highways leading to major cities.

source: http://en.wikipedia.org/wiki/File:Triseal.jpg, http://www.harappa.com/script/index.html