Back ስቲግማ Amharic ستيغما (حرف) Arabic Ϛ ARC Stigma (Buachstob) BAR Стыгма (літара) Byelorussian Стыгма (літара) BE-X-OLD Стигма (буква) Bulgarian Stigma (lizherenn) Breton Stigma Catalan ستیگما (پیت) CKB
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Stigma (ϛ) is a ligature of the Greek letters sigma (Σ) and tau (Τ), which was used in writing Greek between the Middle Ages and the 19th century. It is also used as a numeral symbol for the number 6. In this unrelated function, it is a continuation of the old letter digamma (originally Ϝ, cursive form &sq=Facebook&lang=en&file=File:Greek_Digamma_cursive_01.svg){kind=small}
), which had served as a numeral since antiquity and was conflated with the σ-τ ligature in the minuscule handwriting of the Middle Ages.