*The Indus script, also known as the Harappan script and the Indus Valley script, is a corpus of symbols produced by the Indus Valley Civilisation. Most inscriptions containing these symbols are extremely short, making it difficult to judge whether or not they constituted a writing system used to record a Harappan language, any of which are yet to be identified. Despite many attempts, the “script” has not yet been deciphered. There is no known bilingual inscription to help decipher the script, which shows no significant changes over time. However, some of the syntax (if that is what it may be termed) varies depending upon location.*
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*Inscriptions are very short. The average length of the inscriptions is around five signs, and the longest only 34 characters long, found on a copper plate belonging to the mature Harappan period. Inscriptions vary between just one and seven lines, with single lines being the most common.*
*67 signs account for 80 percent of the writing that has been identified. There are doubts whether the Indus script records a written language or is instead a system of non-linguistic signs or proto-writing similar to merchant’s marks and house marks, and to the contemporary accounting tokens and numerical clay tablets of Mesopotamia. Due to the brevity of inscriptions, some researchers have questioned whether Indus symbols can even express a spoken language.*
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[From Wikipedia:](https://en.wikipedia.org/wiki/Indus_script)
*The Indus script, also known as the Harappan script and the Indus Valley script, is a corpus of symbols produced by the Indus Valley Civilisation. Most inscriptions containing these symbols are extremely short, making it difficult to judge whether or not they constituted a writing system used to record a Harappan language, any of which are yet to be identified. Despite many attempts, the “script” has not yet been deciphered. There is no known bilingual inscription to help decipher the script, which shows no significant changes over time. However, some of the syntax (if that is what it may be termed) varies depending upon location.*
…
*Inscriptions are very short. The average length of the inscriptions is around five signs, and the longest only 34 characters long, found on a copper plate belonging to the mature Harappan period. Inscriptions vary between just one and seven lines, with single lines being the most common.*
*67 signs account for 80 percent of the writing that has been identified. There are doubts whether the Indus script records a written language or is instead a system of non-linguistic signs or proto-writing similar to merchant’s marks and house marks, and to the contemporary accounting tokens and numerical clay tablets of Mesopotamia. Due to the brevity of inscriptions, some researchers have questioned whether Indus symbols can even express a spoken language.*