Indus script

The Indus script (also Harappan script) is a corpus of symbols produced by the Indus Valley Civilization during the [ttps://en.wikipedia.org/wiki/Kot_Diji Kot Diji] and Mature Harappan periods between the 35th and 20th centuries BC. Most inscriptions are extremely short. It is not clear if these symbols constitute a script used to record a language, and the subject of whether the Indus symbols were a writing system is controversial. In spite of many attempts at decipherment,[4] it is undeciphered, and no underlying language has been identified. There is no known bilingual inscription. The script does not show any significant changes over time..
More information on the English , Sindhi and Tamil Wikipedia pages.
The Harappa website has a number of articles on the Indus valley script here 
Category:Bronze Age writing systems
Category:Undeciphered writing systems
Category:Ancient World