High Quality Content by WIKIPEDIA articles! The term Indus script (also Harappan script) refers to short strings of symbols associated with the Indus Valley Civilization, in use during the Mature Harappan period, between the 26th and 20th centuries BC. It is not generally accepted that these symbols form a script used to record a language, and the subject remains controversial. In spite of many attempts at decipherments and claims, it is as yet undeciphered, and no underlying language has been identified. There is no known bilingual inscription.