Why can't anyone read the Indus script after a century of trying?
Over 100 mutually exclusive decipherments have been published, and Tamil Nadu has announced a million-dollar prize for the answer.
▶ Start the storyThousands of small stone seals from the Indus cities carry a row of symbols that nobody alive can read. The Indus script is a set of symbols produced by the Indus Valley Civilisation, and despite many attempts it has not been deciphered. By 1992 an estimated 4,000 inscribed objects had been discovered, with over 400 distinct signs across them.
Why is it so hard? Most inscriptions are extremely short, with an average length of around five signs, which makes it difficult even to judge whether they recorded a language at all. There is also no known . Egyptian hieroglyphs were cracked with the help of the , which says the same thing in more than one script, and with the names of rulers like Rameses and Ptolemy, which could be matched with Greek records. Nothing like that has been found for the Indus. And the spoken Harappan language has not been identified, so even if we could read the signs, we would not know which language they spell.
~5 signs
Scholars do agree on a few things: most inscriptions read from right to left, and some stroke-like signs are numerals. Beyond that, over 100 mutually exclusive attempts at have been published since the 1920s. In 2025 Tamil Nadu's chief minister, M. K. Stalin, announced a prize of $1 million for deciphering the script.
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Recap
Indus inscriptions are very short, there is no Rosetta Stone, and the spoken Harappan language is not identified, so nobody can read them yet.
💡 A trick to remember it · A lock with five tiny teeth and no key: the Indus script is too short, with no Rosetta Stone, to crack.
Surprising fact · Over 100 mutually exclusive decipherments have been published since the 1920s.
Sources (1)
No source, no claim. Every fact in this lesson (15 claims) cites at least one of these.