What is Stigma (letter)?
{{Greek alphabet|letter=stigma}} '''Stigma''' (uppercase/lowercase '''Ϛ ϛ'''), is a sign that was used in the [[Greek alphabet]] for the combination of the two letters [[Sigma (letter)|Sigma]] (σ) and [[Tau (letter)|Tau]] (τ). It is also used as a symbol for the number 6 in the system of [[Greek numerals]]. [[Category:Greek alphabet]] {{Europe-stub}}