The Greek letter that vanished from language but survived as a number

Cultures · Published 3 October 2026 Swipe more like this →

In short: Digamma was once a vital Greek letter representing the /w/ sound, but it disappeared from the alphabet before the classical era. Yet, it never truly died. It persisted for millennia as a numeral for six, eventually morphing into a ligature that still haunts modern Greek typography and historical scholarship.

Originally adopted from the Phoenician letter waw, digamma occupied the sixth position in the archaic Greek alphabet. It represented the voiced labial-velar approximant /w/, a sound present in Mycenaean Greek and detectable in the meter of Homeric epics. By the classical period, however, the /w/ sound had largely vanished from most Greek dialects, leading to the letter's obsolescence in written text. Its name, digamma, literally means 'double gamma,' a nod to its visual resemblance to two stacked Γ characters.

While its role as a consonant faded, digamma remained essential as a numeral. In the Miletus system, it retained its sixth-place position, representing the number 6. Over centuries of handwriting, the symbol underwent significant transformations. By the Byzantine era, it had evolved into a cursive form that was visually conflated with a ligature of sigma and tau. This new shape, known as stigma (ϛ), became the standard representation for the number 6, a function it continues to serve in modern Greek today.

The history of the symbol is marked by complex nomenclature and confusion. Medieval scholars and theologians, such as the Venerable Bede, referred to it as episēmon, a term later misinterpreted by humanists like Joseph Justus Scaliger to describe a broader class of extra-alphabetic numerals. Meanwhile, the visual similarity between stigma and other characters—such as the final sigma (ς) or the numeral koppa—has frequently challenged scribes and printers. Today, while the alphabetic digamma is used by linguists to reconstruct ancient forms like ϝοῖνος (wine), the numeral stigma remains a distinct, if often misunderstood, relic of a lost phonetic past.

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