Stigma (letter)

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Greek alphabet
Αα Alpha Νν Nu
Ββ Beta Ξξ Xi
Γγ Gamma Οο Omicron
Δδ Delta Ππ Pi
Εε Epsilon Ρρ Rho
Ζζ Zeta Σσ Sigma
Ηη Eta Ττ Tau
Θθ Theta Υυ Upsilon
Ιι Iota Φφ Phi
Κκ Kappa Χχ Chi
Λλ Lambda Ψψ Psi
Μμ Mu Ωω Omega
Obsolete letters
Ϝϝ Digamma Ϸϸ Sho
Ϛϛ Stigma Ϙϙ Qoppa
Ϻϻ San Ϡϡ Sampi

Greek diacritics

Stigma (uppercase Ϛ, lowercase ϛ) is a ligature of the Greek letters sigma and tau, sometimes used in modern times to represent the Greek numeral 6. However, today the letters στʹ (ΣΤʹ, if capitalised) are more widely used to represent the number 6 or the ordinal 6th.

Greek word στρατόν written with a handwritten variant of stigma, from the Byzantine period
Greek word στρατόν written with a handwritten variant of stigma, from the Byzantine period

It is encoded in Unicode as "Greek letter stigma" U+03DA (Ϛ) and "Greek small letter stigma" U+03DB (ϛ). Small stigma is similar in appearance to final sigma (ς), but the top loop tends to be larger, and extends farther to the right.

'Stigma' is also a name for the cursive graphic form of the letter digamma when used as the Greek numeral 6. This name is a modern misunderstanding. The ligature of στ did not occur in ancient times and only dates to later medieval manuscripts. In Sophocles' Lexicon of Byzantine Greek, which covers late antique Greek up to 1000 AD, there is no mention of "stigma" as either a ligature or a number.

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