There are in human history a handful of scripts that no one has ever managed to decipher. The script of the Seven Rivers civilisation is among them. Since the first seals of Mohenjo-daro were brought out of the ground in the early twentieth century, generations of linguists, archaeologists, mathematicians and computer scientists have tried. All have failed. And this enigma says much about the civilisation itself.
What we know: the facts
The Indus script has around 400 distinct signs — too many for a pure alphabet (which generally has between 20 and 30) and too few for a complete logographic system like ancient Chinese (which has several thousand). It sits in an intermediate zone that suggests a syllabary or a mixed system.
The inscriptions are almost all very short — an average of five signs. They appear primarily on steatite seals, on clay tablets, and on copper objects. These supports accompanied commercial exchange: merchants of the Sapta Sindhu travelled as far as Mesopotamia with their seals, and Indus seals have been found at Ur and at Kish. This foreign presence testifies to commercial networks as vast as those I described in [my article on weights and measures on saptasindhuveda.com] — the same roads that carried standardised measures also carried these undeciphered seals.
Five theories, no certainty
Decipherment attempts arrive at radically different conclusions — which itself says something about the state of the question.
Rekha Rao proposed that the script was used primarily for religious purposes — seals worn around the neck as memory aids for apprentice priests, the signs perhaps representing plants used in Vedic sacrifices.
Asko Parpola, the great Finnish specialist, concluded that it might be an early form of a Dravidian language, after decades comparing the signs with modern and ancient Dravidian languages.
Iravatham Mahadevan supported the same Dravidian hypothesis and attempted to link the signs to Brāhmī — the alphabet that preceded Devanāgarī.
S.R. Rao proposed an alphasyllabic reading, right to left, with correspondences to the Brāhmī alphabet.
Walter Fairservis leaned toward a logographic proto-writing in which each sign represented a word or an idea.
Five incompatible theories. None has convinced the scientific community.
Why no Rosetta Stone?
The Rosetta Stone allowed the decipherment of Egyptian hieroglyphics because it presented the same text in three languages, one of which — Greek — was known. For the Indus script, nothing of the kind has ever been found. No bilingual text, no glossary, no transcription into another script.
There is also a more radical hypothesis: some researchers believe the Indus script was not a full writing system at all, but a notation system — ownership marks, merchant identifiers, ritual symbols — that did not encode a spoken language. In that case it would be by definition undecipherable, because there would be no language behind the signs, only practical conventions.
What the silence says about the civilisation
This silent script may be the most fitting metaphor for the Seven Rivers civilisation. A society that left us no king-lists, no triumphal inscriptions, no declarations of military victory. Its texts — if they are texts — accompanied bags of goods and religious ceremonies, not the egos of the powerful. On certain seals one finds figures in deep meditative posture — the same yogis I described in [my article on the engraved bestiary on saptasindhuveda.com]. The yogi’s body, motionless in its posture, is itself a form of silence — a message without words.
This civilisation, like its signs, was not trying to tell itself to future centuries. It was living.
The script and death
These 400 signs traced in steatite four thousand years ago make me think of Yama — the first dead of the Rig Veda who “watched over the many paths” beyond the frontier of life. The Indus script is perhaps that road: a route traced to be followed, still waiting for its ferryman. Yama opened the way for the dead; perhaps one day someone will open the way through these signs. I explore the figure of Yama in detail in my article on Yama on rigveda.blog.
