An diofar eadar na mùthaidhean a rinneadh air "Sigma"

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Loidhne 1:
[[Image:Greek letter sigma-tb.png|right|thumb]]
 
Tha'S e '''Sigma (Σ, σ, ς)''' naan ochdamh litir deug den [[aibidil Ghreugach]]. Tha e co-ionnan ri [[S]] sasan [[aibidil]] againne.
 
{{aibidil Ghreugach}}